(a) Velocity field (2﹩\farcs﹩5 resolution) overlaid on the integrated intensity map (gray scale) in the region where arm M1 crosses the major axis. Cloud complexes A8, A9, and A10 are indicated in the figure. The contour spacing is 5 km s⁻¹, and the gray scale ranges from 0 to 12 Jy beam⁻¹ km s⁻¹. (b) Velocity field (2﹩\farcs﹩5 resolution) overlaid on the integrated intensity map (gray scale) in the region where arm M2 crosses the major axis. Cloud complexes A1 and A2 are indicated in the figure. The contour spacing is 5 km s⁻¹, and the gray scale ranges from 0 to 8 Jy beam⁻¹ km s⁻¹. (c) Position‐velocity cut through the A1 GMA and the S1 spur feature, at P.A. 90°. The velocity decreases (on the blueshifted side of the galaxy this translates to a redshift) right before the gas enters the arm, and then increases (appears as a decrease on the blueshifted side) steeply in the arm. The expected (Roberts 1993) peak in dispersion right before the arm is also present. (d) Position‐velocity cut along the minor axis. (e) Blowup of (d), showing only the cut through the western M1 arm. Indicated as a dashed line is the RS87 model of radial streaming motion.