interpolate lterp using GrADS 2.0 and Wgrib2

[amelia graziano]

With GRIB1 I used udft.regrid2 to interpolate.

e.g.

d regrid2(u10*2,0.25,0.25);regrid2(v10*2,0.25,0.25)'

I know I can now use "lterp" wich comes with GrADS 2.0, but I don't
know how to use it. I would appreciate any help. My goal is to
intepolate "prmslmsl", "ugrd10m" and "vgrd10m"

Thanks a lot

Amelia