Overview of the HALOGAS observations of NGC 672. The left panel is as in Fig. 1. The contours begin at N_{H i} = 2.5 × 10¹⁹ cm^-2 and increase by powers of two. The right panel shows the first-moment image derived from the lowest-resolution H i cube. The grayscale ranges from 245 km s^-1 (black) to 570 km s^-1 (white). Contours are white on the approaching side and black on the receding side, and run from 255 km s^-1 to 600 km s^-1 in steps of 15 km s^-1. The white contour closest to the center of the primary galaxy, corresponding to 425 km s^-1, represents the systemic velocity of NGC 672.