Fig. A.4
NHI(v)−TB relation for different sight-lines predicted by our fiducial ISM model. The light-cone aperture is α = 0.2°. The two dashed lines show the analytic solutions, given by Eq. (3), for two isothermal layers of H I at the spin temperature of 8000 K and 80 K. The choice of the sightline produces little scatter in the relation.
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