def _copy_non_t_vars(data0, data1):
    """Copies non-t-indexed variables from data0 into data1, then
    returns data1"""
    non_t_vars = [v for v in data0.data_vars
                  if 't' not in data0[v].dims]
    # Manually copy over variables not in `t`. If we don't do this,
    # these vars get polluted with a superfluous `t` dimension
    for v in non_t_vars:
        data1[v] = data0[v]
    return data1