Fig. 6
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Upper limit abundances in the solid phase of CH3CN with respect to CH3OH estimated for ices toward W33A, EC92, IRAS03235+3004, and L1455 IRS3. The horizontal dashed lines show the gas-phase values for the hot molecular core Sgr B2(N2), the Comet 67P/C-G coma, and the binary protostar IRAS 16293B (from Jørgensen et al. 2020).
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