def plot(self, key=None, invert=None, plotmethod='imshow',
             cmap=plt.cm.gray, ms=4, Max=None,
             fs=None, dmargin=None, wintit=None,
             draw=True, connect=True):
        """ Plot the data content in a predefined figure  """
        dax, KH = _plot.Data_plot(self, key=key, invert=invert, Max=Max,
                                  plotmethod=plotmethod, cmap=cmap, ms=ms,
                                  fs=fs, dmargin=dmargin, wintit=wintit,
                                  draw=draw, connect=connect)
        return dax, KH
Plot the data content in a predefined figure