@verbose
    def __init__(self, data, vertices=None, tmin=None, tstep=None,
                 subject=None, verbose=None):

        if not isinstance(vertices, list) or len(vertices) < 2:
            raise ValueError('Vertices must be a list of numpy arrays with '
                             'one array per source space.')

        _BaseSourceEstimate.__init__(self, data, vertices=vertices, tmin=tmin,
                                     tstep=tstep, subject=subject,
                                     verbose=verbose)
dataset/ETHPy150Open mne-tools/mne-python/mne/source_estimate.py/MixedSourceEstimate.__init__/original