docs: SC/21---insert some white space bfore a figure to avoid a cramp…

…ed look.

(cherry picked from commit 74af3fa)

docs/sc/021/sc21.tex

@@ -2994,8 +2994,8 @@ \subsection{\xlabel{Galactic}Extended galactic sources}
 \end{myquote}
 The final mask is shown in the right-panel of \cref{Figure}{fig:mask}{this figure},
 note how is encompasses more emission and has softer edges than the
-first threshold map.
-\\
+first threshold map. \\
+
 \myfigduo{sc21_gal_mask1}{sc21_gal_mask2}{t!}{width=0.475\linewidth}{fig:mask}{2mm}{
   \textbf{(left)} The initial mask created by thresholding 850map\_snr
   to 3$\sigma$. \textbf{(right)} Second mask made by thresholding the