| http://www.w3.org/ns/prov#value | - The system also includes means for releasing gas including xenon from the tube 1 should it be desired to reduced the pressure in the tube 1, or should a partial pressure of one of the gases such as the xenon be determined to be too high, or if a gas replenishment action such as partial gas replacement or mini gas replacement such as are described in the '785 application is to be performed, or if a
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