.add(
            new go.Panel('Graduated', {
              name: 'SCALE',
              margin: 14,
              graduatedTickUnit: 2.5, // tick marks at each multiple of 2.5
              graduatedMax: 100, // this is actually the default value
              stretch: go.Stretch.None // needed to avoid unnecessary re-measuring!!!
            })
              .bind('graduatedMax', 'max') // controls the range of the gauge
              .add(
                // the main path of the graduated panel, an arc s