tick mark for Lambert plot

NCL users,

The attached file is a NCL scripts and a plot made by this script. Can one help
put the tick mark on the same longitude on top and bottom?
In addition, why is there the warning message as: "warning:cnFillOn is not a
valid resource in map at this time", since if "cnFillOn" is commented out, there
will be no color filled.
Thanks a lot!

Mark

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