gcf=figure;
figure_width_to_save = 12.5; %cm
figure_height_to_save= 10; %cm
set(gcf,'PaperPositionMode','manual');
set(gcf,'PaperUnits','centimeters');
set(gcf,'PaperPosition',[0 0 figure_width_to_save figure_height_to_save]);
saveas(gcf,[savefigures_path,savefigure_name,'.tiff'],'tiffn');