Figures
- Pre-Global Surveyor evidence for Martian ground water

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Fig. 1. The log of the globally averaged depth of water stored in the Martian crust today (H₁) and at early times H_o for two values of $rho$ , the ratio of D/H in today's atmospheric water vapor to the primordial ratio (2.6 and 5.2). These results are for a simple unconstrained escape of hydrogen with a constant ratio of escape flux to H, the depth of the hydrogen supply.

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Fig. 2. The log of the globally averaged depth of water stored in the crust today (H₁) and at early times H_o for two values of the total D/H fractionation $rho$ = 2.6 and 5.2 and for two possible values of the fractionation occurring during t_z, the time when Zagami apatites were crystallized, 1.04 and 1.01. Here, t_z is 1.3.

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Fig. 3. The log of the globally averaged depth of water stored in the crust today (H₁) and at times H_o for two values of the total D/H fractionation, $rho$ = 2.6 and 5.2, and for two possible values of the fractionation occurring during t_z, the time when Zagami apatites were crystallized, 1.04 and 1.01. Here, t_z is 180 Myr.