address review comments

astropy · Mar 29, 2022 · 623248b · 623248b
1 parent d1f1837
commit 623248b
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/specreduce/tests/test_background.py b/specreduce/tests/test_background.py
@@ -7,6 +7,7 @@
 from specreduce.tracing import FlatTrace
 
 
+# NOTE: same test image as in test_extract.py
 # Test image is comprised of 30 rows with 10 columns each. Row content
 # is row index itself. This makes it easy to predict what should be the
 # value extracted from a region centered at any arbitrary Y position.

diff --git a/specreduce/tracing.py b/specreduce/tracing.py
@@ -62,15 +62,17 @@ def _bound_trace(self):
 
     def __add__(self, delta):
         """
-        Return a copy of the trace shifted by delta pixels perpendicular to the axis being traced
+        Return a copy of the trace shifted "forward" by delta pixels perpendicular to the axis
+        being traced
         """
         copy = deepcopy(self)
         copy.shift(delta)
         return copy
 
     def __sub__(self, delta):
         """
-        Return a copy of the trace shifted by delta pixels perpendicular to the axis being traced
+        Return a copy of the trace shifted "backward" by delta pixels perpendicular to the axis
+        being traced
         """
         return self.__add__(-delta)