OptionalbandwidthOptionalopacityFill opacity of the violin body (default: 0.3)
Optionalscale'area': one density scale, every violin encloses the same area (default); 'width': each violin reaches full width
OptionalshowInner box (whisker line, IQR bar, median dot); false = median line only (default: true)
Gaussian kernel bandwidth in data units (default: Silverman's rule per group)