Convert ECMWF hybrid coord to pressure for used with Grads

[J Lee]

Hi All,

I have data set from ECMWF that are in hybrid sigma coordinate.  I do can
convert them to pressure coordinate with known surface pressure.  Wondering,
however after I got the pressure at each grid at each sigma level, if
someone has a EC program to do the interpolation onto specified pressure
levels available out here?

Thanks in advance,

Frank