CLASS data provide the standard deviations of observations as the uncertainties (data_bnds), but ILAMB will assume the data_bnds as lower and upper limits of the observations, i.e. data_bnds[...,0] is the lower limits and data_bnds[...,1] is the upper limits as seen in the following code.
https://github.com/rubisco-sfa/ILAMB/blob/6780ef0824a8a245ae60e518d5b5fc25f970f3d6/src/ILAMB/Variable.py#L1541C1-L1544C52.
Shall it be fixed in the ilamb code or in the ilamb-data?