text: # A more step by step approach (equally valid)
  fig, (ax1, ax2) = plt.subplots(1, 2, sharey=True, sharex=True)
  data.loc['2009', 'BETN029'].plot(kind='hist', bins=30, ax=ax1)
  ax1.set_title('BETN029')
  data.loc['2009', 'BETR801'].plot(kind='hist', bins=30, ax=ax2)
  ax2.set_title('BETR801')
  # Remark: the width of the bins is calculated over the x data range for each plot individually