Calibration use case failing when loading observations

Hi @aho

As reported by @rmarcos, the Calibration use case fails when loading observations with the message: Error in FUN(X[[i]], ...) : Could not find variable 'latitude' (or its synonims if specified) in the file /esarchive/recon/ecmwf/erainterim/monthly_mean/tas_f6h/tas_200002.nc

When adding the synonyms parameter, it returns: Error in dat[[i]][["selectors"]][[across_inner_dim]] : attempt to select less than one element in get1index

Are you familiar with the latest error message?

This is the Start call I have used:

obs <- Start(dat = '/esarchive/recon/ecmwf/erainterim/monthly_mean/$var$_f6h/$var$_$sdate$.nc',
              var = 'tas',
              sdate = paste0(2000:2010, '02'),
              time = indices(1),
              latitude = values(list(lats.min, lats.max)),
              latitude_reorder = Sort(),
              longitude = values(list(lons.min, lons.max)),
              return_vars = list(latitude = 'dat',
                                 longitude = 'dat',
                                 time = c('sdate')),
 synonims = list(latitude = c('lat', 'latitude'),
                                 longitude = c('lon', 'longitude')),
              split_multiselected_dims = TRUE,
              merge_across_dims = TRUE,
              retrieve = FALSE)

Thanks in advance,

Núria