12 -  18 hour files: total    4 TRaP members.
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.200900.N20_RAIN.04200346.18.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.201500.AMSUM1.04201144.12.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.201500.AMSUM3.04201235.12.Z
/data/Petrap/2025/31P/202531P.WTPS31.PGTW.201500.GHEHR.04201400.12.Z
Grid information: nc,nr,clat,clon:      800     800  -12.20 -138.50
Total independent TRaPs used:   4
Total Ensemble TRaP members:   4