Both panels: show the maximum local fraction of SiO reached in each of the shock models, shown against the shock velocity. The maximum local fraction of SiO is defined as x(SiO)=nSiO/nH. The left and right panels correspond to the SiG (square symbols) and SiM (circle symbols) scenarios (see text), both for a preshock density nH = 104 cm-3. The color code is indicated in the panels, where the G0 (= 0 or 1) value and fraction of preshock free silicon (=1 or 10%) is shown for each model.
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