Fig. 1.  ¹²⁹Xe/¹³²Xe vs. ⁸⁴Kr/¹³²Xe. Solid circle: this work. (The numerical figures represent the extraction temperatures at 100°C.) E:  EETA 79001 glass [5]; L:  LEW 88516 [12]; S:  Shergotty [10]; N:  Nakhla [10]; C:  Chassigny [10]; male symbol:  Mars's atmosphere (large uncertainty is included) [6,13].