[gradsusr] Drawing mean monthly graph

[IZZAT IBRAHIM]

Hi,
Is there anyone using grads for precis? if yes. How can we use the results from precis (have been converted from .pp to .nc) to view or to make mean monthly graph (example file attached)? I have tried basic scripts to draw the graph but it only draws yearly graph not mean monthly. Thank you in advance. 
Khairul.
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