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diff --git a/docs/data/writeThisMultipleXLSX.xlsx b/docs/data/writeThisMultipleXLSX.xlsx
diff --git a/docs/data/writeThisXLSX.xlsx b/docs/data/writeThisXLSX.xlsx
diff --git a/docs/exercises/answers/DataInputOutput_answers.html b/docs/exercises/answers/DataInputOutput_answers.html
diff --git a/docs/exercises/answers/Dataframes_answers.html b/docs/exercises/answers/Dataframes_answers.html
diff --git a/docs/exercises/answers/Functions_answers.html b/docs/exercises/answers/Functions_answers.html
diff --git a/docs/exercises/answers/conditionsAndLoops_answers.html b/docs/exercises/answers/conditionsAndLoops_answers.html
diff --git a/docs/exercises/answers/factorsAndDataframes_answers.html b/docs/exercises/answers/factorsAndDataframes_answers.html
diff --git a/docs/exercises/answers/matrices_answers.html b/docs/exercises/answers/matrices_answers.html
diff --git a/docs/exercises/answers/vector_answers.html b/docs/exercises/answers/vector_answers.html
diff --git a/docs/exercises/exercises/DataInputOutput_exercise.html b/docs/exercises/exercises/DataInputOutput_exercise.html
diff --git a/docs/exercises/exercises/Dataframes_exercise.html b/docs/exercises/exercises/Dataframes_exercise.html
diff --git a/docs/exercises/exercises/Functions_exercise.html b/docs/exercises/exercises/Functions_exercise.html
diff --git a/docs/exercises/exercises/conditionsAndLoops_exercise.html b/docs/exercises/exercises/conditionsAndLoops_exercise.html
diff --git a/docs/exercises/exercises/factorsAndDataframes_exercise.html b/docs/exercises/exercises/factorsAndDataframes_exercise.html
diff --git a/docs/exercises/exercises/matrices_exercise.html b/docs/exercises/exercises/matrices_exercise.html
diff --git a/docs/exercises/exercises/vector_exercise.html b/docs/exercises/exercises/vector_exercise.html
diff --git a/docs/index.html b/docs/index.html
@@ -14,7 +14,6 @@
 
 <title>Introduction to R</title>
 
-<script src="site_libs/header-attrs-2.7/header-attrs.js"></script>
 <script src="site_libs/jquery-1.11.3/jquery.min.js"></script>
 <meta name="viewport" content="width=device-width, initial-scale=1" />
 <link href="site_libs/bootstrap-3.3.5/css/cosmo.min.css" rel="stylesheet" />
@@ -479,8 +478,8 @@ <h2>Course Overview</h2>
 <p><br></p>
 <div id="course-integrity" class="section level3">
 <h3>Course Integrity</h3>
-<p><strong>This course is compiled automatically on <em>2021-02-23</em> </strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AR-CMD-check-bioc"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/R-CMD-check-bioc/badge.svg"></a></p>
-<p><strong>The course is tested and available on MacOS, Windows and Ubuntu Linux for R 4.0</strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AR-CMD-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/R-CMD-check/badge.svg"></a></p>
+<p><strong>This course is compiled automatically on <em>2021-02-23</em> </strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3compilation-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/compilation-check/badge.svg"></a></p>
+<p><strong>The course is tested and available on MacOS, Windows and Ubuntu Linux for R version 4.0.3 (2020-10-10)</strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AOS-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/OS-check/badge.svg"></a></p>
 <p><br> <br></p>
 </div>
 <div id="overview" class="section level3">
@@ -502,10 +501,10 @@ <h4>Install R</h4>
 <p>R can be installed from the R-project website.</p>
 <p>The R website can be found here <a href="http://www.r-project.org/" class="uri">http://www.r-project.org/</a>.</p>
 <p>The download links and associated installation instructions for multiple platforms can be found below provided by Revolution Analytics. <a href="https://cran.revolutionanalytics.com" class="uri">https://cran.revolutionanalytics.com</a></p>
-<p>Direct downloads for main platforms of R 4.0 can be found below</p>
+<p>We recommend installing R 4.0.3 as this is the version used to compile the course. Direct downloads for R 4.0.3 for the main platforms can be found below:</p>
 <ul>
-<li><a href="https://cran.revolutionanalytics.com/bin/macosx/R-4.0.0.pkg">Mac</a></li>
-<li><a href="https://cran.revolutionanalytics.com/bin/windows/base/R-4.0.0-win.exe">Windows</a></li>
+<li><a href="https://cran.revolutionanalytics.com/bin/macosx/R-4.0.3.pkg">Mac</a></li>
+<li><a href="https://cran.revolutionanalytics.com/bin/windows/base/old/4.0.3/R-4.0.3-win.exe">Windows</a></li>
 <li><a href="https://cran.revolutionanalytics.com">Linux platforms</a></li>
 </ul>
 <p><br></p>

diff --git a/docs/presentations/singlepage/introToR_Session1.html b/docs/presentations/singlepage/introToR_Session1.html
diff --git a/docs/presentations/singlepage/introToR_Session2.html b/docs/presentations/singlepage/introToR_Session2.html
diff --git a/docs/presentations/slides/introToR_Session1.html b/docs/presentations/slides/introToR_Session1.html
@@ -4,7 +4,6 @@
     <title>introToR_Session1.utf8</title>
     <meta charset="utf-8" />
     <meta name="author" content="Rockefeller University, Bioinformatics Resource Centre" />
-    <script src="libs/header-attrs-2.7/header-attrs.js"></script>
     <link href="libs/remark-css-0.0.1/default.css" rel="stylesheet" />
     <link rel="stylesheet" href="metropolisCustom.css" type="text/css" />
     <link rel="stylesheet" href="metropolis-fontsCustom.css" type="text/css" />
@@ -2560,51 +2559,51 @@
 &lt;tbody&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_a &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.557025 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.128835 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.590162 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 2.646226 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.547138 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 4.833245 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_b &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.341632 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 6.185260 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 2.579143 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 4.731828 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.864441 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.781426 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_c &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.355578 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 4.522542 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 4.447184 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.653688 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.789682 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.969985 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_d &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.461560 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.807955 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.062500 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.410019 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.925288 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.445745 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_e &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 10.283021 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 8.665671 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.371347 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.532351 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.310967 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.177334 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_f &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.310248 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.081716 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.252667 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.283086 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.542090 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.518443 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_g &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.272982 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 10.572193 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.753310 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.752683 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.341602 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 8.327019 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_h &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.137036 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.267810 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.977415 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.010334 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.948372 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.467797 &lt;/td&gt;
   &lt;/tr&gt;
 &lt;/tbody&gt;
 &lt;/table&gt;
@@ -2963,9 +2962,6 @@
 ## Answers to exercise
 
 Answers can be found [here](../../exercises/answers/DataInputOutput_answers.html)
-
-
-
     </textarea>
 <style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
 <script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>

diff --git a/docs/presentations/slides/introToR_Session2.html b/docs/presentations/slides/introToR_Session2.html
@@ -4,7 +4,6 @@
     <title>introToR_Session2.utf8</title>
     <meta charset="utf-8" />
     <meta name="author" content="Rockefeller University, Bioinformatics Resource Centre" />
-    <script src="libs/header-attrs-2.7/header-attrs.js"></script>
     <link href="libs/remark-css-0.0.1/default.css" rel="stylesheet" />
     <link rel="stylesheet" href="metropolisCustom.css" type="text/css" />
     <link rel="stylesheet" href="metropolis-fontsCustom.css" type="text/css" />
@@ -1384,11 +1383,11 @@
 ```
 
 ```
-## Mean is -0.0701517900525497
+## Mean is 0.290551949290036
 ```
 
 ```
-## [1] 0.4645759
+## [1] -0.4466291
 ```
 
 ---
@@ -1413,10 +1412,10 @@
 ```
 
 ```
-##  [1]  0.46457585  0.65236319  1.33243310 -1.69096325  0.19743968 -2.01103286
-##  [7] -0.13352096 -1.42257553 -0.14270982 -0.21550430 -0.11718848  0.30982831
-## [13] -1.48238035  0.06916913  0.18452349  1.66100742  0.65361017  0.06632491
-## [19]  0.23090587  1.39369443
+##  [1] -0.4466291  1.8349212  0.2935585 -0.5377074  0.4365208  1.4010397
+##  [7]  0.3640984  0.1074542 -1.9522542 -1.0661325  0.7347903  0.7422989
+## [13]  0.3919661 -1.1863846  0.7793160 -1.1099035  0.1063682  1.1170540
+## [19] -1.1493276 -0.8610472
 ```
 
 
@@ -1575,9 +1574,6 @@
 - Local friendly bioinformaticians and computational biologists.
 - [Stackoverflow](http://stackoverflow.com/)
 - [R-help](https://stat.ethz.ch/mailman/listinfo/r-help)
-
-
-
     </textarea>
 <style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
 <script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>

diff --git a/r_course/data/writeThisMultipleXLSX.xlsx b/r_course/data/writeThisMultipleXLSX.xlsx
diff --git a/r_course/data/writeThisXLSX.xlsx b/r_course/data/writeThisXLSX.xlsx
diff --git a/r_course/exercises/answers/DataInputOutput_answers.html b/r_course/exercises/answers/DataInputOutput_answers.html
diff --git a/r_course/exercises/answers/Dataframes_answers.html b/r_course/exercises/answers/Dataframes_answers.html
diff --git a/r_course/exercises/answers/Functions_answers.html b/r_course/exercises/answers/Functions_answers.html
diff --git a/r_course/exercises/answers/conditionsAndLoops_answers.html b/r_course/exercises/answers/conditionsAndLoops_answers.html
diff --git a/r_course/exercises/answers/factorsAndDataframes_answers.html b/r_course/exercises/answers/factorsAndDataframes_answers.html
diff --git a/r_course/exercises/answers/matrices_answers.html b/r_course/exercises/answers/matrices_answers.html
diff --git a/r_course/exercises/answers/vector_answers.html b/r_course/exercises/answers/vector_answers.html
diff --git a/r_course/exercises/exercises/DataInputOutput_exercise.html b/r_course/exercises/exercises/DataInputOutput_exercise.html
diff --git a/r_course/exercises/exercises/Dataframes_exercise.html b/r_course/exercises/exercises/Dataframes_exercise.html
diff --git a/r_course/exercises/exercises/Functions_exercise.html b/r_course/exercises/exercises/Functions_exercise.html
diff --git a/r_course/exercises/exercises/conditionsAndLoops_exercise.html b/r_course/exercises/exercises/conditionsAndLoops_exercise.html
diff --git a/r_course/exercises/exercises/factorsAndDataframes_exercise.html b/r_course/exercises/exercises/factorsAndDataframes_exercise.html
diff --git a/r_course/exercises/exercises/matrices_exercise.html b/r_course/exercises/exercises/matrices_exercise.html
diff --git a/r_course/exercises/exercises/vector_exercise.html b/r_course/exercises/exercises/vector_exercise.html
diff --git a/r_course/index.html b/r_course/index.html
@@ -14,7 +14,6 @@
 
 <title>Introduction to R</title>
 
-<script src="site_libs/header-attrs-2.7/header-attrs.js"></script>
 <script src="site_libs/jquery-1.11.3/jquery.min.js"></script>
 <meta name="viewport" content="width=device-width, initial-scale=1" />
 <link href="site_libs/bootstrap-3.3.5/css/cosmo.min.css" rel="stylesheet" />
@@ -479,8 +478,8 @@ <h2>Course Overview</h2>
 <p><br></p>
 <div id="course-integrity" class="section level3">
 <h3>Course Integrity</h3>
-<p><strong>This course is compiled automatically on <em>2021-02-23</em> </strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AR-CMD-check-bioc"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/R-CMD-check-bioc/badge.svg"></a></p>
-<p><strong>The course is tested and available on MacOS, Windows and Ubuntu Linux for R 4.0</strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AR-CMD-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/R-CMD-check/badge.svg"></a></p>
+<p><strong>This course is compiled automatically on <em>2021-02-23</em> </strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3compilation-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/compilation-check/badge.svg"></a></p>
+<p><strong>The course is tested and available on MacOS, Windows and Ubuntu Linux for R version 4.0.3 (2020-10-10)</strong> <br> <a href="https://github.com/RockefellerUniversity/Intro_To_R_1Day/actions?query=workflow%3AOS-check"><img src="https://github.com/RockefellerUniversity/Intro_To_R_1Day/workflows/OS-check/badge.svg"></a></p>
 <p><br> <br></p>
 </div>
 <div id="overview" class="section level3">
@@ -502,10 +501,10 @@ <h4>Install R</h4>
 <p>R can be installed from the R-project website.</p>
 <p>The R website can be found here <a href="http://www.r-project.org/" class="uri">http://www.r-project.org/</a>.</p>
 <p>The download links and associated installation instructions for multiple platforms can be found below provided by Revolution Analytics. <a href="https://cran.revolutionanalytics.com" class="uri">https://cran.revolutionanalytics.com</a></p>
-<p>Direct downloads for main platforms of R 4.0 can be found below</p>
+<p>We recommend installing R 4.0.3 as this is the version used to compile the course. Direct downloads for R 4.0.3 for the main platforms can be found below:</p>
 <ul>
-<li><a href="https://cran.revolutionanalytics.com/bin/macosx/R-4.0.0.pkg">Mac</a></li>
-<li><a href="https://cran.revolutionanalytics.com/bin/windows/base/R-4.0.0-win.exe">Windows</a></li>
+<li><a href="https://cran.revolutionanalytics.com/bin/macosx/R-4.0.3.pkg">Mac</a></li>
+<li><a href="https://cran.revolutionanalytics.com/bin/windows/base/old/4.0.3/R-4.0.3-win.exe">Windows</a></li>
 <li><a href="https://cran.revolutionanalytics.com">Linux platforms</a></li>
 </ul>
 <p><br></p>

diff --git a/r_course/presentations/singlepage/introToR_Session1.html b/r_course/presentations/singlepage/introToR_Session1.html
diff --git a/r_course/presentations/singlepage/introToR_Session2.html b/r_course/presentations/singlepage/introToR_Session2.html
diff --git a/r_course/presentations/slides/introToR_Session1.html b/r_course/presentations/slides/introToR_Session1.html
@@ -4,7 +4,6 @@
     <title>introToR_Session1.utf8</title>
     <meta charset="utf-8" />
     <meta name="author" content="Rockefeller University, Bioinformatics Resource Centre" />
-    <script src="libs/header-attrs-2.7/header-attrs.js"></script>
     <link href="libs/remark-css-0.0.1/default.css" rel="stylesheet" />
     <link rel="stylesheet" href="metropolisCustom.css" type="text/css" />
     <link rel="stylesheet" href="metropolis-fontsCustom.css" type="text/css" />
@@ -2560,51 +2559,51 @@
 &lt;tbody&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_a &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.557025 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.128835 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.590162 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 2.646226 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.547138 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 4.833245 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_b &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.341632 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 6.185260 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 2.579143 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 4.731828 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.864441 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.781426 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_c &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.355578 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 4.522542 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 4.447184 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.653688 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.789682 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.969985 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_d &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.461560 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 3.807955 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 5.062500 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.410019 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 5.925288 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 3.445745 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_e &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 10.283021 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 8.665671 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.371347 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.532351 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.310967 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.177334 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_f &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.310248 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 11.081716 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.252667 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.283086 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.542090 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.518443 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_g &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.272982 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 10.572193 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.753310 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 10.752683 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.341602 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 8.327019 &lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
    &lt;td style="text-align:left;"&gt; Gene_h &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.137036 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.267810 &lt;/td&gt;
-   &lt;td style="text-align:right;"&gt; 9.977415 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 9.010334 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.948372 &lt;/td&gt;
+   &lt;td style="text-align:right;"&gt; 11.467797 &lt;/td&gt;
   &lt;/tr&gt;
 &lt;/tbody&gt;
 &lt;/table&gt;
@@ -2963,9 +2962,6 @@
 ## Answers to exercise
 
 Answers can be found [here](../../exercises/answers/DataInputOutput_answers.html)
-
-
-
     </textarea>
 <style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
 <script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>

diff --git a/r_course/presentations/slides/introToR_Session2.html b/r_course/presentations/slides/introToR_Session2.html
@@ -4,7 +4,6 @@
     <title>introToR_Session2.utf8</title>
     <meta charset="utf-8" />
     <meta name="author" content="Rockefeller University, Bioinformatics Resource Centre" />
-    <script src="libs/header-attrs-2.7/header-attrs.js"></script>
     <link href="libs/remark-css-0.0.1/default.css" rel="stylesheet" />
     <link rel="stylesheet" href="metropolisCustom.css" type="text/css" />
     <link rel="stylesheet" href="metropolis-fontsCustom.css" type="text/css" />
@@ -1384,11 +1383,11 @@
 ```
 
 ```
-## Mean is -0.0701517900525497
+## Mean is 0.290551949290036
 ```
 
 ```
-## [1] 0.4645759
+## [1] -0.4466291
 ```
 
 ---
@@ -1413,10 +1412,10 @@
 ```
 
 ```
-##  [1]  0.46457585  0.65236319  1.33243310 -1.69096325  0.19743968 -2.01103286
-##  [7] -0.13352096 -1.42257553 -0.14270982 -0.21550430 -0.11718848  0.30982831
-## [13] -1.48238035  0.06916913  0.18452349  1.66100742  0.65361017  0.06632491
-## [19]  0.23090587  1.39369443
+##  [1] -0.4466291  1.8349212  0.2935585 -0.5377074  0.4365208  1.4010397
+##  [7]  0.3640984  0.1074542 -1.9522542 -1.0661325  0.7347903  0.7422989
+## [13]  0.3919661 -1.1863846  0.7793160 -1.1099035  0.1063682  1.1170540
+## [19] -1.1493276 -0.8610472
 ```
 
 
@@ -1575,9 +1574,6 @@
 - Local friendly bioinformaticians and computational biologists.
 - [Stackoverflow](http://stackoverflow.com/)
 - [R-help](https://stat.ethz.ch/mailman/listinfo/r-help)
-
-
-
     </textarea>
 <style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
 <script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>

diff --git a/r_course/presentations/slides/libs/header-attrs-2.7/header-attrs.js b/r_course/presentations/slides/libs/header-attrs-2.7/header-attrs.js
diff --git a/r_course/site_libs/header-attrs-2.7/header-attrs.js b/r_course/site_libs/header-attrs-2.7/header-attrs.js