[gradsusr] problem in shding the correlated areas

[kombo kai]

Hi to all grads user
I am doing correlation using tcorr command and I want to shade the most significnat area
i used my script like this
tcorr(cru, sst, t=1,t=34)
clevs= -0.42 0.42
set black -0.42 0.42
then I used the hatch command but does not work 
how can I fix this problem
kaimombo

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