Zeroth-moment map of the region around the NGC 289 absorber NVSS J005245−311503 in greyscale. The map was created by collapsing channels of the r00_t00 data cube between 1708 and 1725 km s⁻¹, corresponding to ±3σ around the CNM central velocity. No masking was applied. Cyan contours show the H I column density at 0.02 and 0.04 Jy beam⁻¹ km s⁻¹ (corresponding to 4.4 × 10²⁰ and 8.8 × 10²⁰ cm⁻², respectively). Red contours show velocities of 1692 (southernmost), 1702, 1712, and 1722 km s⁻¹ (northernmost). The pink hatched regions indicate the intersection of the annulus with lines at PA = −55°, which we used to derive the emission spectrum. The r00_t00 beam is shown in the lower right.