def drawCMSHeader( pad, lumi_text, extra_text ):
pad.cd()
top_margin = pad.GetTopMargin();
header_offset = top_margin * 0.2
left_margin = pad.GetLeftMargin();
header = TLatex( left_margin, 1 + header_offset * top_margin, 'CMS' )
header.SetNDC()
header.SetTextAngle( 0 )
header.SetTextColor( ROOT.kBlack )
header.SetTextFont( 61 )
header.SetTextAlign( 11 )
cmsLabelSize = top_margin * 0.8
header.SetTextSize( cmsLabelSize )
cms_x_position = header.GetXsize()
header.DrawLatex( left_margin, 1 - top_margin + header_offset, 'CMS' )
extra_text_size = cmsLabelSize * 0.76
header.SetTextFont( 52 )
header.SetTextSize( extra_text_size )
header.DrawLatex( left_margin + 1.2 * cms_x_position, 1 - top_margin + header_offset, extra_text )
lumi_text_size = top_margin * 0.6
header.SetTextFont(42);
header.SetTextAlign(31);
header.SetTextSize( lumi_text_size )
right_margin = pad.GetRightMargin();
header.DrawLatex( 1. - right_margin, 1. - top_margin + header_offset, lumi_text )
