// set the stroke for each series...
plot.getRenderer().setSeriesStroke(0, new BasicStroke(2.0f,
BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND,
1.0f,
new float[] { 10.0f, 6.0f },
0.0f));
plot.getRenderer().setSeriesStroke(1, new BasicStroke(2.0f,
BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND,
1.0f,
new float[] { 6.0f, 6.0f },
0.0f));
plot.getRenderer().setSeriesStroke(2, new BasicStroke(2.0f,
BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND,
1.0f,
new float[] { 2.0f, 6.0f },
0.0f));