Set limits for the point sizes.

        :param min: point size for the lowest value.
        :param max: point size for the highest value.

def set_slimits(self, row, column, min, max):
        """Set limits for the point sizes.

        :param min: point size for the lowest value.
        :param max: point size for the highest value.

        """
        subplot = self.get_subplot_at(row, column)
        subplot.set_slimits(min, max)