code: function drawVerticalLegend() {
              svg.select('.legend-group')
                  .selectAll('g')
                  .remove();
  
              entries = svg.select('.legend-group')
                  .selectAll('g.legend-line')
                  .data(data);
  
              // Enter
              entries.enter()
                .append('g')
                  .classed('legend-line', true)
                    .append('g')
                      .classed('legend-entry', true)
                      .attr('data-item', getId)
                      .attr('transform', function(d, i) {
                          let horizontalOffset = markerSize + getLineElementMargin(),
                              lineHeight = chartHeight/ (data.length + 1),
                              verticalOffset = (i + 1) * lineHeight;
  
                          return `translate(${horizontalOffset},${verticalOffset})`;
                      })
                      .merge(entries)
                    .append('circle')
                      .classed('legend-circle', true)
                      .attr('cx', markerSize/2)
                      .attr('cy', markerYOffset)
                      .attr('r', markerSize/2 )
                      .style('fill', getCircleFill)
                      .style('stroke-width', 1);
  
              svg.select('.legend-group')
                  .selectAll('g.legend-line')
                  .selectAll('g.legend-entry')
                .append('text')
                  .classed('legend-entry-name', true)
                  .text(getName)
                  .attr('x', getLineElementMargin())
                  .style('font-size', `${textSize}px`)
                  .style('letter-spacing', `${textLetterSpacing}px`);
  
              if (hasQuantities) {
                  writeEntryValues();
              } else {
                  centerVerticalLegendOnSVG();
              }
  
              // Exit
              svg.select('.legend-group')
                  .selectAll('g.legend-line')
                  .exit()
                  .transition()
                  .style('opacity', 0)
                  .remove();
          }
docs: Draws the entries of the legend
  @private