code: def add_to_line_plot(ax, x, y, color = '0.' , label = ''):
      ''' This function takes an axes and adds one line to it '''
      plt.sca(ax)
      plt.plot(x,y, color = color, label = label)
      return af add_to_line_plot(ax, x, y, color = '0.' , label = ''):
      ''' This function takes an axes and adds one line to it '''
      plt.sca(ax)
      plt.plot(x,y, color = color, label = label)
      return ax
docs: This function takes an axes and adds one line to it