gsn_csm_xy (wks,tim,dots,res)

Dear NCL users,

The attached files are ncl script, input data and a plot. The plot is what I
wanted but with a trick to make it using "gsn_csm_xy".

(1) why here did the "bot_plot = gsn_csm_xy (wks,tim,dots,res)" always ask
2-dimension data (dots), so I have to duplicate the same data one more time?
(2) How to make "res@lbLabelStride= 1" work?
(3) How to overlay "dots" on the top?

Thanks a lot!
Mark

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