[gradsusr] Wind Barb Minimum

[Daniel Nairn]

Hello

I'm successfully running a Grads script to display 850mb winds using wind
barbs:-

for example

'define u10 = const(ugrdprs(lev=850),0,-u)'
'define v10 = const(vgrdprs(lev=850),0,-u)'
'set gxout barb'
'set cmin 20'
'd skip(u10*1.94,14,14);v10*1.94'

What I would like to do is use something like 'set cmin 20' to display only
winds above 20 kts. However, setting this in the script file doesn't appear
to work (I still get barbs with values less than 20kts appearing). Should I
be using something else?

Thanks
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