 contents (default=[0.022
        0.6]).
    step_sizes : 2-tuple
        Step size of the grid search; the first value is the stepping of the
        lower bound (which essentially steps over any dropout samples), and
        the second value is the stepping over possible scales (i.e., clean-
        data quantiles) (default=[0.01, 0.01]).
    beta : array
        Range that the clean EEG distribution&#39;s shape parameter beta may take.

    Returns
    -------
    mu : array
        Estimated mean of the