code: def plot_imag(fignum, Bimag, Mimag, s):
      
      plt.figure(num=fignum)
      plt.clf()
      if not isServer:
          plt.figtext(.02, .01, version_num)
      plt.plot(Bimag, Mimag, 'r')
      plt.xlabel('B (T)')
      plt.ylabel('M/Ms')
      plt.axvline(0, color='k')
      plt.title(s)
docs: function to plot d (Delta M)/dB  curves