sec-2: add the mode plot both in the section and in the folder

slides/sections/2.md

@@ -73,10 +73,16 @@ $$
 
 ## Landau mode
 
+::::: {.columns}
+
+:::: {.column width=50%}
+
   - Maximum $\hence \partial_x L(\mu) = 0$
 
   . . .
 
+  \vspace{20pt}
+
   - Computed by numerical minimization (Brent)
 
   \setbeamercovered{}
@@ -85,13 +91,20 @@ $$
     \begin{tikzpicture}[remember picture]
       \node at (0,0) (here) {$\mu_L\ex = − 0.22278...$};
       \pause
-    \node [opacity=0.5, xscale=0.32, yscale=0.25 ] at (here)
+      \node [opacity=0.5, xscale=0.65, yscale=0.5 ] at (here)
             {\includegraphics{images/high.png}};
     \end{tikzpicture}
   \end{center}
 
   \setbeamercovered{transparent}
 
+::::
+
+::: {.column width=50%}
+  ![](images/mode.pdf)
+:::
+:::::
+
 
 ## Landau FWHM