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The CAMS_GFAS file naming convention is based on WMO guidelines as follows:

z_cams_c_ecmf_yyyymmdd000_vvvv_tt_lt_param.[grib|nc]

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ecmfis the WMO location indicators. The list can be found here.
yyyymmddis the base date of the forecast.
vvvvis a version or experiment identifier. gfas is used for GFAS products, prod will be used for operational products, test (or experiment ID) will be used for testing purposes, rean for reanalysis if needed.
tttype of data, fc - forecast, an - analysis
ltis the type of level. sfc for surface fields, ml for model level fields, pl for pressure level products, 
param

is the parameter short name as defined here

grib, nc

is the format of a file, GRIB or NETCDF

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