         startAngle: -90,
                  endAngle: 90,
                  track: {
                    background: "#e7e7e7",
                    strokeWidth: '97%',
                    margin: 5, // margin is in pixels
                    dropShadow: {
                      enabled: true,
                      top: 2,
                      left: 0,
                      color: '#444',
                      opacity: 1,
                      blur: 2
                    }
                  },
              