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% codes_info
  ecCodes Version 2.17.10
  Default definition files path is used: /usr/local/apps/eccodes/2.17.10/GNU/7.3.0/share/eccodes/definitions
...
# Go to the definitions directory for GRIB edition 2
% cd /usr/local/apps/eccodes/2.17.10/GNU/7.3.0/share/eccodes/definitions/grib2
% cat template.4.11.def
include "grib2/template.4.parameter.def"
include "grib2/template.4.horizontal.def"
include "grib2/template.4.eps.def"
include "grib2/template.4.statistical.def"

% cat template.4.8.def
include "grib2/template.4.parameter.def"
include "grib2/template.4.horizontal.def"
include "grib2/template.4.statistical.def"

# We see that the only difference is the inclusion of the ensemble file (template.4.eps.def)
# Now look in the ensemblethis file to see what keys are there
% more template.4.eps.def
...
unsigned[1] perturbationNumber  : dump;
...
# This tells us there is a one-octet key called perturbationNumber