Hi christian

you can change from sigma to pressure coordinates using ~/bin/sigma2p ATM_output.nc

To change to specific pressure levels you have to change the code sigma2p.F90 in the PostProc directory. 
Just change the data for  plevs according to your interest. Also don't forget to change the number of plevs, the default is 11 and recompile
 hope this answers your question

best regards,
Netsanet
On Monday, April 14, 2014 9:57 AM, CHOUMBOU Paul Christian <paulchoumbou@gmail.com> wrote:
  Hi!
I RegCM4 model simulations, however files ATM outputs allow me to use
pressure coordinates as the data are sigma coordinates.
I would have to know the outputs of the RegCM model in pressure
coordinates (1000hPa, 975hPa, 950hPa, ect ...) whereas the latter is
in sigma coordinates.
   Thank you in advance to have a look for my problem.
Regard
                              Christian
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