docs: def plotSolidAngleCMD(self):
          """
          Solid angle within the mask as a function of color and magnitude.
          """
          msg = "'%s.plotSolidAngleCMD': ADW 2018-05-05"%self.__class__.__name__
          DeprecationWarning(msg)
  
          import ugali.utils.plotting        
          ugali.utils.plotting.twoDimensionalHistogram('mask', 'color', 'magnitude',
                                                       self.solid_angle_cmd,
                                                       self.roi.bins_color,
                                                       self.roi.bins_mag,
                                                       lim_x = [self.roi.bins_color[0],
                                                                self.roi.bins_color[-1]],
                                                       lim_y = [self.roi.bins_mag[-1],
                                                                self.roi.bins_mag[0]])