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Published online by Cambridge University Press: 19 March 2018
Gas can be observed to flow from a wide variety of stars into the interstellar medium, and to do so in a fascinating variety of ways. In some flows, the temperature exceeds a million degrees; in others, it cannot be distinguished from zero. Flow velocities range from 5 000 km/s down to one or two km/s at the limit of detection. The particle densities in some flows are at least 109 times larger than in others. The rates of mass-loss span the range from zero to probably more than 1026 g/s.