``cbars``: A `~.collections.LineCollection` instance that marks
            the centers of each violin's distribution.

          - ``cmedians``: A `~.collections.LineCollection` instance that
            marks the median values of each of the violin's distribution.

          - ``cquantiles``: A `~.collections.LineCollection` instance created
            to identify the quantile values of each of the violin's
            distribution.

        c