import ROOT

ROOT.gStyle.SetPalette(56)

f = ROOT.TF2("f", "xygaus")

f.SetParameters(1, 1, 0.5, 1, 0.5)

f.Draw("colz")

f.SetMinimum(0)
f.SetMaximum(1)

rep = ''
while not rep in [ 'q', 'Q' ]:
	ROOT.gSystem.ProcessEvents()
	rep = raw_input('enter "q" to quit: ')
	if 1 < len(rep):
		rep = rep[0]