def matEdimList(sType='stacked'):
    """
    Return standard list of dimensions for matrix elements.

    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 ['LM', 'Eke', 'Sym', 'mu', 'it', 'Type']
    elif sType is 'sDict':
        return {'LM': ['l', 'm'], 'Sym': ['Cont', 'Targ', 'Total']}
    else:
        return ['l', 'm', 'Eke', 'Cont', 'Targ', 'Total', 'mu', 'it', 'Type']
