why the contour line interval label of the panel plots is different from the individual plot?

 hi, everyone. I have a question about the interval of the line label in
NCL. I plot a 3*3 panel plot using

gsn_panel(wks,(/p1,p2,p3,p4,p5,p6,p7,p8,p9/),(/3,3/),panel_res)

and the individual plots setting are:

    xyres@cnLineLabelsOn = True
    xyres@lbLabelBarOn = False
    xyres@cnInfoLabelOn = False
    xyres@cnLineLabelInterval = 1 ; labels for every line
(default=2)
    xyres@tmYROn = False
    xyres@gsnDraw = False ; don't draw yet
    xyres@gsnFrame = False ; don't advance frame yet

However, when i finish plot the panel, the interval label turns to be 4.
(It is 1 in the individual plot.)

Why is that?

                                  Thank you very much :)

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Received on Mon Jan 25 02:33:29 2010