Dear REGCM Users

I am having the RegCM output in Rotated Merchator Projection. When I am plotting the rainfall after taking the average it showing a clear picture of average rainfall for that period in Grads-2-0-a8 as in the attached figure rain_before_fwrite.jpg. But when I took the average and wrote in to another file using fwrite command and plotted it showing some undefined values as shown in the attached figure rain_after_fwrite.jpg. I don't know where is the problem. I have attached the script in which i used the fwrite command and both control files which I used for calculating the rainfall and plotting rainfall before and after fwrite. I have also tried this with Grads-1.7, 1.9, 2-0-a7, 2-0-a8, 2-0-a9 versions. Nowhere I have over come of this problem. Please give me some suggestion. Where I have done the mistake.

Please help me in this regard.
Thanks in advance.
Kanhu