[gradsusr] Extracting the lat-lon points along the contour line

[Lyndz]

Dear GrADS experts,

I have the following plot generated using GrADS.
The red line is the 0 contour line of meridional wind speed (vwnd).

'set gxout contour'
'set t 'Tmin
'set ccolor 9'
'set clevs 0'
'set cthick 6'
'd vwnd(lev=925)'

I would like to extract the lat-lon points along the contour line.
Is this possible in GrADS?
I'll appreciate any help.

Sincerely,
Lyndz
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