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what is the easiest way of Interpolating from model to pressure levels

Dear all,
I am working on Postprocessing of WRFCHEM output and some of the variables are 4 Dimensional.
I have been trying to interpolate from eta model level to presure levels with NCL but I have not been be able to suceed on this.

kindly advise on the best method to do the interpolation probably with NCL or other methods

with regards
Julius Akinyoola
If you are familiar with NCL, then it is the best option you can use to put data from model level to pressure level. Specifically, the function vintp2p_ecmwf should work fine for WRF data.