H I velocity-integrated emission (zeroth moment, left panel) and intensity-weighted velocity (first moment, right panel) maps. The integration range is from V_HEL = 506.7 to 1125.1 km s⁻¹ to cover all the H I features. In both panels the contour levels are set to (5, 15, 25, 35, …, 145)×0.055 Jy beam⁻¹ km s⁻¹. The galaxies NGC 3628, M 65, and M 66 are labeled in both panels and a tiny filled ellipse in the lower left shows the beam. The red line in the upper left illustrates the 50 kpc scale at a distance of 11.3 Mpc. Three blue dashed ellipses in the left panel demonstrate the main H I emission regions of the three galaxies.