def set_sim_data(inj, field, data):
    """Sets data of a SimInspiral instance."""
    try:
        sim_field = sim_inspiral_map[field]
    except KeyError:
        sim_field = field
    # for tc, map to geocentric times
    if sim_field == 'tc':
        inj.geocent_end_time = int(data)
        inj.geocent_end_time_ns = int(1e9*(data % 1))
    else:
        setattr(inj, sim_field, data)
Sets data of a SimInspiral instance.