def METHOD_NAME(self, axis):
    for item in self.plot.items:
        if isinstance(item, self.ResultsClass):
            item.x = axis
            item.update_data()
    label, units = self.parse_axis(axis)
    self.plot.setLabel('bottom', label, units=units, **self.LABEL_STYLE)
    self.x_axis = axis
    self.x_axis_changed.emit(axis)