def list_transit_times(t0, period, steps_or_num_transits=range(0, 10), return_string=False):
    """List the transit times based on the supplied transit parameters"""
    if isinstance(steps_or_num_transits, int):
        steps = range(0, steps_or_num_transits)
    else:
        steps = steps_or_num_transits
    times = [t0 + period * i for i in steps]
    if return_string:
        return ",".join(map(str, times))
    else:
        return times