fortran/c interface problems?

[Barry]

Hi all

I am new so excuse me if someone has already asked this question;
I have not gone through the index yet.

I have written code to create my own binary data set in FORTRAN.
When grads reads it to display the data, I get a zero value ADDED
to my data so when I contour my field, it has a bullseye in it
trying to draw for the zero. The zero is absolutely NOT on my
data that I am writing out- I have double and triple checked this!
When I plot a 3_D array, the zero moves around in a predictable manner.

My feeling is that fortran writes binary files differently than C with
an extra few bytes (header)- that grads, probably written in c,
reads and interprets differently. Is there a  way around this that
I failed to read about in the documentation?

If anyone can help, it would be greatly appreciated.
I like grads alot but I need to fix this to make it useful.

Thanks,

Barry