@staticmethod
def _create_axis_label_string(axis):
    """Create axis label conforming to conventions used in science

        This method is called automatically and indirectly by :meth:`plot`.

        If you ever need to change the appearance of your axes labels,
        override this method in a child class.
        """
    label = ''
    if axis.quantity:
        label = '$' + axis.quantity + '$' + ' / ' + axis.unit
    return label
