Distribution of N(H₂), V_LSR, and V_g. (a) Distribution of N(H₂) and V_LSR along the rectangular strip shown in Fig. A.2a. The dots and shaded regions represent the mean and standard deviation range for each box in the strip. The dashed and solid vertical lines mark the boundary of two concentric circular regions shown in Fig. 3. (b) Radial plots for V_LSR and V_g drawn from the center of concentric circles (Fig. 3). The vertical dotted-dashed line shows the boundary of the inner circle in Fig. 3.