function drawHorizontalExtendedLine() {
            baseLine = svg.select('.grid-lines-group')
                .selectAll('line.extended-x-line')
                .data([0])
                .enter()
                  .append('line')
                    .attr('class', 'extended-x-line')
                    .attr('x1', (xAxisPadding.left))
                    .attr('x2', chartWidth)
                    .attr('y1', chartHeight)
                    .attr('y2', chartHeight);
        }
Draws a vertical line to extend x-axis till the edges
@return {void}