[RegCNET] How to get the output data of RegCM in pressure cordinates ?

[CHOUMBOU Paul Christian]

   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