var xAxisNode = svg.append("g")
            .attr("class", "x axis")
            .attr("transform", "translate(0," + margin.heightExMargins + ")")
            .style("stroke","#000")
            .style("stroke-width", (s != null && s.getAxisStrokeWidth() != null ? s.getAxisStrokeWidth() : ChartConstants.DEFAULT_AXIS_STROKE_WIDTH))