| 
  | add_histo(ax,
        data,
        color,
        na_color='#D9D9D9',
        grey_axes_decorations=True) |  |  Add a histogram to the right of the given axes 
    Parameters:
        ax(matplotlib.axes.Axes) - The axes to add the histogram todata(list) - The data to calculate the histogram forcolor(str) - The color for the histogram barsna_color(str) - The color for the "NA" text if no data is present. 
          Defaults to light gray.grey_axes_decorations(bool) - If True, the spines, ticks, and axis labels will be colored dark 
          gray.  If False, they will be colored the default matplotlib 
          colors.Returns: matplotlib.axes.AxesThe newly added histogram axes |