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Fig. 3

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Column density of 13CO2 produced after implantation of 30 keV 13Cq+ (q = 1, 2, 3) ions at 15 K and 80 K. The experimental data for 13C+ implanted at 16 K and 77 K in water ice were obtained in Catania (Strazzulla et al. 2003). The solid lines represent linear least square fits, the corresponding production yields are shown in Table 1.

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