Tspin as function of the H I density following Bahcall & Ekers (1969) for three different combinations of locations and fluxes as described in Sect. 5.1 (black lines). The red and blue lines indicate the density as a function of Tspin as derived from the absorption data of Mrk 231. The intersection defines a relatively narrow region for the values of Tspin and density for the outflowing H I (see Sect. 5.1 for details).
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