H I line and radio continuum emission overlaid on an optical R-band grey image (PanSTARRS). The magenta contours represent the integrated H I line emission in selected velocity ranges, as indicated in Fig. B.5. IRAS F00163-1039: 7998.06-8359.56 km s⁻¹, IRAS F02152+1418: 3600-4200 km s⁻¹, IRAS F13373+0105: 6425.81-6995.61 km s⁻¹, IRAS F15276+1309: 3697.75-4277.18 km s⁻¹, IRAS F20221-2458: 3011.4-3152.88 km s⁻¹, IRAS F23488+1949: 4180.91-4626.35 km s⁻¹. The initial contour levels for these sources are at the 2 σ level, with values of 0.368, 0.298, 0.154, 0.339, 0.439, and 0.433 mJy/beam, respectively. Only IRAS F23448+1949 has a second contour (2σ ×2), while other sources have only the first contour. In blue, the emission of the L-band radio continuum is depicted, with the first contour levels set at level 3 σ -specifically, 1.062, 0.992, 0.672, 0.765, 1.431, and 2.121 mJy/beam, respectively. The contour levels follow a pattern (1 2 4 8,...). The ellipses at the bottom left of each panel indicate the beam size of the interferometric observations, as depicted in Table B.3.