[gradsusr] Maskout

[d.nairn]

Hello

I have this maskout command working for only displaying temperatures above 20(c)

'define mytemp2 = const(const(maskout(mytemp,mytemp-20),1),0.0,-u)'

I cannot figure out how to rewrite that command to display only temperatures below 0(c)
Can anybody help me out?

Thanks
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