Positions of fifteen sightlines (black dots with names) from the HyGAL program in the Galactic plane. This distribution plot is reproduced based on the Fig. 3 of Paper I. Colored curves represent different Milky Way spiral arms; the 3-kpc arm is in yellow, the Norma and outer arms are in red, the Scutum-Centaurus arm is in blue, the Sagittarius-Carina arm is in purple, the Perseus arm is in black, and the local arm is in cyan. The Sun and the Galactic center (GC) are marked with the red Sun and asterisk symbols, respectively. The gray-shaded ellipse around the GC represents the long bar.