Left: schematic diagram showing the best-fit drop abundance profile for O2 (red line) assuming O2 follows the same freeze-out and sublimation processes as C18O. A constant (light blue) abundance profile is also shown. Middle: best-fit gaseous O2 profiles obtained via gas-grain modeling. Models HO and IO are shown in solid lines and models HL, IL and GL using a lower O + OH rate coefficient in dashed lines. As shown in Fig. 8 these are the maximum abundances of gaseous O2 that can be hidden in the spectrum. Right: O2 ice abundances for the best fit models. Solid lines show HO and IO whereas dashed lines are Models GL, HL and IL.
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