text: # -*- coding: utf-8 -*-
  """
  This file is part of pyCMBS.
  (c) 2012- Alexander Loew
  For COPYING and LICENSE details, please refer to the LICENSE files
  """
  from pycmbs.data import Data
  from pycmbs.plots import map_difference
  import matplotlib.pyplot as plt
  
  file_name = '../../../pycmbs/examples/example_data/air.mon.mean.nc'
  A = Data(file_name, 'air', lat_name='lat', lon_name='lon', read=True, label='air temperature')
  B = A.copy()
  B.mulc(2.3, copy=False)
  a = A.get_climatology(return_object=True)
  b = B.get_climatology(return_object=True)
  
  # a quick plot as well as a projection plot
  f1 = map_difference(a, b, show_stat=False, vmin=-30., vmax=30., dmin=-60., dmax=60.)  # unprojected
  plt.show()
  