...

Pattern for file names

yyyymm_cccc_PARAM.svs[.Z]
where:
yyyymm is year and month of the calendar month data are relevant for;
cccc is the 4-character WMO identifier of the originating centre
(ammc=Melbourne, cwao=Montreal, dems=New Delhi, ecmf=ECMWF, edzw=Offenbach, egrr=Exeter, kwbc=Washington, lfpw=Toulouse, rjtd=Tokyo, rksl=Seoul, rums=Moscow, ...);
PARAM is the string identifying the parameter:

...