def METHOD_NAME(self, width_microns, height_microns):
    """
    Sets slits gap in microns
    Args:
        width_microns (int):
        height_microns (int):
    """
    if self._slits:
        self._slits.set_horizontal_gap(width_microns / 1000.0)
        self._slits.set_vertical_gap(height_microns / 1000.0)