Draw a chart to visualize quantiles

def quants_(self, inf, sup, chart_type="point",
				color="green"):
		"""
		Draw a chart to visualize quantiles
		"""
		try:
			return self._bokeh_quants(inf, sup, chart_type, color)
		except Exception as e:
			self.err(e, self.quants_, "Can not draw quantile chart")