Helper to readjust `IFC_data` graphs in case of missing feature, region, population.
adjustGraph(obj, selection, ...)
an object of class `IFC_data` extracted by ExtractFromDAF(extract_features = TRUE) or ExtractFromXIF(extract_features = TRUE).
when provided, indices of desired graphs. Note that indices are read from left to right, from top to bottom.
other arguments to be passed.