           .group(group)
         chart.xAxis().ticks(CHART_LAYOUT_PARAMS.ticks)
         chart.yAxis().ticks(CHART_LAYOUT_PARAMS.ticks)
-        chart.margins().left += 6;
+        chart.margins().left += CHART_LAYOUT_PARAMS.leftMargin;
 
       # Render all the charts.
       dc.renderAll()

      #   they can be bound to mouse events.
      d3.selectAll('.chart-body').moveToFront()

  ]
    CHART_LAYOUT_PARAMS =
      height: 280
      width: 600
      axisPadding: .2
      symbolSize: 8
      ticks: 4
      leftMargin: 6

    # The default chart data types to be displayed, by collection.
    DEFAULT_CHARTS:
