code: def mini_histogram(series, **kwargs):
      
      imgdata = BytesIO()
      plot = _plot_histogram(series, figsize=(2, 0.75), **kwargs)
      plot.axes.get_yaxis().set_visible(False)
  
      if LooseVersion(matplotlib.__version__) <= '1.5.9':
          plot.set_axis_bgcolor("w")
      else:
          plot.set_facecolor("w")
  
      xticks = plot.xaxis.get_major_ticks()
      for tick in xticks[1:-1]:
          tick.set_visible(False)
          tick.label.set_visible(False)
      for tick in (xticks[0], xticks[-1]):
          tick.label.set_fontsize(8)
      plot.figure.subplots_adjust(left=0.15, right=0.85, top=1, bottom=0.35, wspace=0, hspace=0)
      plot.figure.savefig(imgdata)
      imgdata.seek(0)
      result_string = 'data:image/png;base64,' + quote(base64.b64encode(imgdata.getvalue()))
      plt.close(plot.figure)
      return result_string
docs: Plot a small (mini) histogram of the data.
  
      Parameters
      ----------
      series: Series
          The data to plot.
  
      Returns
      -------
      str
          The resulting image encoded as a string.