Grouped region LCIA CoV guide
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When process_mrio(...) uses region grouping and the grouped outputs are later
used with LCIA uncertainty, provide a matching CoV file in this folder.

File name:
- reg_cbca_covs_group_<group_version>.csv

Required columns:
- exio_code: grouped MRIO region label
- cov: coefficient of variation used by LCIA uncertainty

The exio_code labels must match the grouped_mrio labels in the matching
data_raw/mrio/<source>/grouping/group_reg_<group_version>.csv file and must
include World. If a grouped label is unchanged from the original EXIOBASE
region list, copy its CoV from reg_cbca_covs.csv. If a grouped label aggregates
several regions, explicitly choose or compute the CoV.
