Fig. G.1.
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Initial velocity V0, maximal velocity Vmax, and terminal velocity for free-molecular expansion Vfree as a function of source temperature (TN). From left to right, CO2-dominated, H2O-dominated, and H2O-CO2 gas mixture. The range for 3I/ATLAS (in blue) delineates the expansion velocities measured in the blue and red wings of the line profiles (i.e. VHM values, see main text).
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