自定义颜色，超出数组错误

[icebound1]

levs = [0.1,1, 10, 25, 50,100, 250] cols = [(255,255,255),(164,242,148),(54,186,71),(99,184,252),(30,15,250),(252,13,246),(129,0,64)]

imlayer=contourfm(x,y,data1,levs,colors=cols)

报错： graphics = GraphicFactory.createContourPolygons(x.asarray(), y.asarray(), a.asarray(), ls, smooth) at wcontour.Contour.createContourLines_UndefData(Contour.java:437)

at wcontour.Contour.tracingContourLines(Contour.java:49)

at org.meteoinfo.render.java2d.ContourDraw.tracingContourLines(ContourDraw.java:82)

at org.meteoinfo.chart.graphic.GraphicFactory.createContourPolygons(GraphicFactory.java:5348)

at sun.reflect.GeneratedMethodAccessor117.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

java.lang.ArrayIndexOutOfBoundsException: java.lang.ArrayIndexOutOfBoundsException: 0

imlayer=contourfm(x,y,data1,20)能够正常运行，有时候将levs改为[0.9,10,25,50,100,250]也能正常运行，但大部分会报错，这是什么原因？

[Yaqiang]

The number of colors should be one more than the number of contour line values.