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Fig. B.1

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Top: Time evolution of the ortho-H2D+/para-D2H+ ratio (top) and density (bottom) for a reference case with ncore = 104 cm−3, T = 10 K, CRIR = 2.5 × 10−17 s−1, and initial H2 OPR = 0.1, for different collapse speeds (βff = [1, 2, 3, 5, 10]). The green shaded area represents the range of observed values, only detections are considered in this specific case (see Table 2). Bottom: Evolution of the ortho-H2D+/para-D2H+ ratio with respect to the density for the same parameters. The red shaded area represents the range of densities for the observed cores.

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