Get axis settings options including ticks, x- and y-labels
        and limits.

def _process_axsettings(self, hist, lims, ticks):
        """
        Get axis settings options including ticks, x- and y-labels
        and limits.
        """
        axis_settings = dict(zip(self.axis_settings, [None, None, (None if self.overlaid else ticks)]))
        return axis_settings