12 -  18 hour files: total    2 TRaP members.
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.181500.AMSUM1.04181225.12.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.181500.GHEHR.04181400.12.Z
Grid information: nc,nr,clat,clon:      800     800  -12.10 -140.65
Total independent TRaPs used:   2
Total Ensemble TRaP members:   2