The original library comes from NCEP/NOAA sp_v2.0.2

Changes for the wgrib2 distribution:  See README.WNE

fftpack.f is from netlib (public domain)
decomp.f is from netlib (public domain)
solve.f is from netlib (public domain)

The splib is primarily the work of Mark Iredell (federal employee, EMC/NCEP/NWS/NOAA)
and is in the public domain.  Modifications were done by employees of EMC/NCEP/NWS/NOAA,
CPC/NCEP/NWS/NOAA and perhaps NCO/NCEP/NWS/NOAA.  (Some of the people worked for both 
NCO and EMC.)  The files authored by Mark Iredell include:

spanaly.f spdz2uv.f speps.f spfft1.f spffte_essl.f spffte.f spfft.f spfftpt.f spgradq.f spgradx.f
spgrady.f splaplac.f splat.f splegend.f sppad.f spsynth.f sptezd.f sptez.f sptezmd.f sptezm.f
sptezmv.f sptezv.f sptgpmd.f sptgpm.f sptgpmv.f sptgpsd.f sptgps.f sptgpsv.f sptgptd.f sptgpt.f
sptgptsd.f sptgptvd.f sptgptv.f sptrand.f sptran.f sptranf0.f sptranf1.f sptranf.f sptranfv.f sptranv.f
sptrund.f sptrun.f sptrung.f sptrungv.f sptrunl.f sptrunm.f sptrunmv.f sptruns.f sptrunsv.f
sptrunv.f spuv2dz.f spvar.f spwget.f ncpus.F

Wesley Ebisuzaki 9/18/2020
Climate Prediction Center
NCEP
