12 -  18 hour files: total    4 TRaP members.
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.181500.AMSUM1.04181225.18.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.182100.GHEHR.04181800.12.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.182100.N20_RAIN.04181531.12.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.182100.RRH_AMSR.04181626.12.Z
Grid information: nc,nr,clat,clon:      800     800  -12.25 -141.00
Total independent TRaPs used:   4
Total Ensemble TRaP members:   4