And yet more font sizes fixed

example/example.tex

@@ -256,7 +256,7 @@ D.L. Eaton, Porous Glass Support Material, US Patent No. 3 904 422 (1975).
 
 \end{thebibliography}
 
-\section*{Acknowledgements}
+\subsection*{Acknowledgements}
 This work was financially supported by the PRACE project funded in part 
 by the EU’s Horizon 2020 Research and Innovation programme (2014-2020) 
 under grant agreement 823767.

prace.cls

@@ -192,15 +192,15 @@
 \def\section{\@startsection {section}{1}{\z@}%
 	{-3.0ex \@plus -.8ex \@minus -.2ex}%  beforeskip, corresponding to 18pt in total
 	{3.3ex \@plus.7ex}%                   afterskip, corresponding to 18pt in total
-	{\normalfont\normalsize\bfseries}}
+	{\normalfont\Large\bfseries}}
 \def\subsection{\@startsection{subsection}{2}{\z@}%
 	{-3.0ex \@plus -.8ex \@minus -.2ex}%  beforeskip, corresponding to 18pt in total
 	{2.0ex \@plus.67ex}%                  afterskip, corresponding to 12pt in total
-	{\normalfont\normalsize\itshape}}
+	{\normalfont\large\bfseries}}
 \def\subsubsection{\@startsection{subsubsection}{3}{\z@}%
 	{-1.67ex \@plus -.8ex \@minus -.2ex}% beforeskip, corresponding to 12pt in total
 	{2.0ex \@plus.67ex}%                  afterskip, corresponding to 12pt in total
-	{\normalfont\normalsize\itshape}}
+	{\normalfont\large\itshape}}
 % redefine section, figure etc. format
 \def\thesection       {\arabic{section}.}
 \def\thesubsection    {\thesection\arabic{subsection}.}
@@ -256,4 +256,23 @@
 
 % ref.number in References
 \def\@biblabel#1{\indent[#1]}
-
+% and changed formatting of heading
+\renewenvironment{thebibliography}[1]
+     {\subsection*{\refname}% <- changed to match style of subsection
+      \@mkboth{\MakeUppercase\refname}{\MakeUppercase\refname}%
+      \list{\@biblabel{\@arabic\c@enumiv}}%
+           {\settowidth\labelwidth{\@biblabel{#1}}%
+            \leftmargin\labelwidth
+            \advance\leftmargin\labelsep
+            \@openbib@code
+            \usecounter{enumiv}%
+            \let\p@enumiv\@empty
+            \renewcommand\theenumiv{\@arabic\c@enumiv}}%
+      \sloppy
+      \clubpenalty4000
+      \@clubpenalty \clubpenalty
+      \widowpenalty4000%
+      \sfcode`\.\@m}
+     {\def\@noitemerr
+       {\@latex@warning{Empty `thebibliography' environment}}%
+      \endlist}

template.tex

@@ -264,7 +264,7 @@
 %   - additional acknowledgements may be added
 %   - names of PRACE machines and the corresponding sites and countries
 %     should be inserted to end of the general PRACE acknowledgement 
-\section*{Acknowledgements}
+\subsection*{Acknowledgements}
 This work was financially supported by the PRACE project funded in part 
 by the EU’s Horizon 2020 Research and Innovation programme (2014-2020) 
 under grant agreement 823767.