code: def _bokeh_quants(self, inf, sup, chart_type, color):
          
          try:
              ds2 = self._duplicate_()
              qi = ds2.df[ds2.y].quantile(inf)
              qs = ds2.df[ds2.y].quantile(sup)
              ds2.add("sup", qs)
              ds2.add("inf", qi)
              ds2.chart(ds2.x, ds2.y)
              if chart_type == "point":
                  c = ds2.point_(opts=self.chart_opts, style=self.chart_style)
              elif chart_type == "line_point":
                  c = ds2.line_point_(opts=self.chart_opts, style=self.chart_style)
              else:
                  c = ds2.line_(opts=self.chart_opts, style=self.chart_style)
              ds2.color(color)
              ds2.chart(ds2.x, "sup")
              c2 = ds2.line_()
              ds2.chart(ds2.x, "inf")
              c3 = ds2.line_()
              ds2.rcolor()
              return c * c2 * c3
          except Exception as e:
              self.err(e, "Can not draw quantile chart")
docs: Draw a chart to visualize quantiles