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Fig. 1.

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GASS/LAB H I 21 cm temperature profile (solid blue line and red dots for the GASS and LAB measurements, respectively), compared with the K I λ7699 (black line) and Na I D (gray line) interstellar absorptions. The units of the right vertical axis are erg cm−2 s−1 Å−1. Telluric absorptions are marked with the ⊕ symbol. Velocities are in the Local Standard of Rest (LSR) reference frame.

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