Fixed forgotten \f$

src/parameterizations/vertical/_V_diffusivity.dox

@@ -272,7 +272,7 @@ The original version concentrates buoyancy work in regions of strong stratificat
 \subsection subsection_danabasoglu_back Danabasoglu background mixing
 
 The shape of the \cite danabasoglu background mixing has a uniform background value, with a dip
-at the equator and a bump at \f$\pm 30^{\circ}$ degrees latitude. The form is shown in this figure
+at the equator and a bump at \f$\pm 30^{\circ}\f$ degrees latitude. The form is shown in this figure
 
 \image html background_varying.png "Form of the vertically uniform background mixing in \cite danabasoglu2012. The values are symmetric about the equator."
 \imagelatex{background_varying.png,Form of the vertically uniform background mixing in \cite danabasoglu2012. The values are symmetric about the equator.,\includegraphics[width=\textwidth\,height=\textheight/2\,keepaspectratio=true]}