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. 2001 Feb 27;98(5):2182–2187. doi: 10.1073/pnas.051530998

Figure 4.

Figure 4

Calculated and empirical vapor pressures in the range 15–200 K (68, 69). Compounds include interstellar grain mantle (N2, CO, CO2) and hydrogenated nebular species (CH4, C2H4, C2H6, C3H6, C3H8, NH3). C2H6, C3H8, and NH3 are enlarged for clarity.