Procmail and mailbox attributes

I have a problem :) My procmail script works fine, but how can I change
permissions on file it creates so that others in my group could read and
write to that file? Here's the beef^H^H^H^Hfile:

:0                      
* ^Subject:.*cats[^t]
{
        :0 fhw
        | formail  -z -x Subject:  
        :0
        *
        ./data/. 
}     

It checks if subject include cats and if yes, then copies subject line
to file which is named by ascending numbering in directory. Now I just
would like to change permissions of that file.

Thanks,
        Ryde
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