def construct_SN_default_rows(timestamps, ants, nif, gain=1.0):
    """ Construct list of ants dicts for each
        timestamp with REAL, IMAG, WEIGHT = gains
    """
    default_nif = [gain] * nif
    rows = []
    for ts in timestamps:
        rows += [{'TIME': [ts],
                  'TIME INTERVAL': [0.1],
                  'ANTENNA NO.': [antn],
                  'REAL1': default_nif,
                  'REAL2': default_nif,
                  'IMAG1': default_nif,
                  'IMAG2': default_nif,
                  'WEIGHT 1': default_nif,
                  'WEIGHT 2': default_nif}
                 for antn in ants]
    return rows