def BLMdimList(sType='stacked'):
    """
    Return standard list of dimensions for calculated BLM.

    Parameters
    ----------
    sType : string, optional, default = 'stacked'
        Selected 'stacked' or 'unstacked' dimensions.
        Set 'sDict' to return a dictionary of unstacked <> stacked dims mappings for use with xr.stack({dim mapping}).

    Returns
    -------
    list : set of dimension labels.

    """
    if sType is 'stacked':
        return ['Euler', 'Eke', 'BLM']
    elif sType is 'sDict':
        return {'BLM': ['l', 'm'], 'Euler': ['P', 'T', 'C']}
    else:
        return ['Eke', 'l', 'm', 'P', 'T', 'C']
