def METHOD_NAME(filename):
    """
    Read true time step data from individual time steps.
    Returns
    -------
    steps : array
        The time steps.
    times : array
        The times of the time steps.
    nts : array
        The normalized times of the time steps, in [0, 1].
    dts : array
        The true time deltas.
    """
    io = MeshIO.any_from_filename(filename)
    steps, times, nts = io.read_times()
    dts = nm.ediff1d(times, to_end=0)
    return steps, times, nts, dts