Ratios of the [OI] 3P1–3P2 over the H2 S(1) and S(3) lines for pre-shock densities of 2 × 104 and 2 × 105 cm-3 (left and right panels, respectively) and C- or J-type shocks (upper and lower panels). Shaded areas show the observed upper and lower limits of the ratios. The observed ratio overlaps only with J-shock model predictions for velocities between 20–25 km s-1. (Figure adapted from FPDF’10.)
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