how to plot figure using the average -

Dear NCL,

I made a figure with data to each month, now I need to average for 3
months. I have doubt if I use *dim_avg *or only *avg.*
 I get to print the values both when using dim_avg or avg in the screen,
 but I can not plot the charts because I doubt this part of my script
"plot(0) = gsn_csm_contour_map_ce(wks,w,res)", I don't know the syntax for
"w" variable

Appear the following message when try run my script in ncl

fatal:(lat) is not a dimension name in variable (w), could not determine
dimension number
fatal:["Execute.c":8128]:Execute: Error occurred at or near line 110 in
file precconv1999_2000_media.ncl

The script is attached.

Thank you,
Débora Alvim.

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