def fixture_sample_data() -> tuple:
    """Returns a tuple of ragged sizes and interarrival times."""
    sizes = [[1350, 1350, -600, 70], [1300, 1350, 1200], [1200, 1350]]
    times = [[0, 0.010, 0.020, 0.03], [0, 0.015, 0.025], [0, 0.020]]
    return (sizes, times)