Adjust the space between TPT and UPSAY logos in the letter

lettre-upsay.tex

@@ -54,7 +54,7 @@
 % The fist page heading logo
 \def\combinelogo{%
    \begin{minipage}[t][4cm][c]{2.5cm}%
-         \includegraphics[width=2.5cm]{logo-gray}\\
+         \includegraphics[width=2.5cm]{logo-gray}\\[2.5mm]
          \includegraphics[width=2.5cm]{logo-upsay-red}
    \end{minipage}%
 }