Problem with pres_hybrid_ccm

Hello,

I used "pres_hybrid_ccm" to get the pressure levels. Then I calculated
Potential temperature and used "center_finite_diff_n" to calculate
vertical gradient of potential temperature. But the pressure values from a
model output have surface pressure as the 26th level and 3mb as the 1st.
So when I am calculating gradient its doing opposite way starting from 3mb
to surface level instead of surface and going upwards. I am attaching the
code in case you need to see something.
Can anybody suggest how to fix this issue?

Thanks,

-- 
*************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
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