Top left: VLA continuum map of B2 0258+35 (beam size: 1.13″ × 0.98″; red contours). The contour levels start from 1 mJy beam⁻¹ (3σ) and increase by a factor of two. The 3σ negative contours are shown in grey and the beam is shown in the bottom right corner of the image. The regions from which the H I absorption spectra are extracted are labelled. The 22 GHz VLA map (by Giroletti et al. 2005, beam size: 0.12″ × 0.12″) is overlaid in blue contours to show the underlying continuum structure. These contours start from 325 μJy beam⁻¹ (5σ) and increase by a factor of two. Bottom left, bottom right, and top right: absorption spectra extracted from the regions that are marked are in black in the continuum map. The spectra have been Hanning-smoothed and resampled to a velocity resolution of ∼42 km s⁻¹.