[gradsusr] Plot single grid value at specific lat/lon?

[Christopher Gilroy]

Is there anyway to plot a specific value from a lat/lon?

set lat 41
set lon -75
d tmp2m

Returns a value if done at the command-line but doesn't seem to do anything
when done with:

'set gxout grid'
'set lat 41'
'set lon -75'
'd tmp2m'
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