Interpolate RUC13 data from hybrid coordinates to pressure levels?

Hi everyone,

I have a question regarding vertical interpolation of RUC13 data.

I want to convert data from RUC13 (GRIB file) that is in hybrid-b
coordinates to pressure levels, and create plots similar to
http://www.ncl.ucar.edu/Applications/Scripts/vert_1.ncl (horizontal plots).
Eventually I also want to plot this data in a vertical cross-section, and
I'm not sure how to interpolate data from hybrid levels to vertical plane.

However, in order to properly use function vinth2p I need information about
hybrid coefficients which my data does not have (or I can't locate them at
least).
I've attached ncl_filedump output for my RUC13 *.grb file for your
reference.

I would greatly appreciate any help with this as I've been trying to solve
this problem for a while now and I wasn't able to get anything. I use NCL
5.2.0.

Thanks very much in advance for your help,

Dragana

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