st update_hist =
			      plot_histogram(pdfgraph, data, barwidth, xscale, yscale);

			//slider
			control_container
			    .insert("p")
			    .attr("align", "center")
			    .attr("id", "slidertitle-"+i)
			    .text("Barwidth");

			control_container
			    .insert("svg")
			    .attr("width", wsvg)
			    .attr("height", hslider)
			    .attr("id", "slider-"+i)
			    .append("g")
			    .attr("transform", "translate("+(wsvg-wslider)/2+",10)")
			    .call(d3
				  .sliderBottom()
				  .min(min_slider