sizeUnit

("x", "y", "min", "max"). Relate the size of the text to the length of the unit step along one of the axes. "x" uses the unit step along the x-axis, "y" uses the unit step along the y-axis. "min" uses the smaller of the unit steps along the x- and y-axes. "max" uses the larger of the unit steps along the x- and y-axes. If not specified, no fitting is performed.