Fig. 1

WHT V, R, I color image. Yellow contours are from the GMRT 610 MHz image (Fig. 4) and drawn at levels of [1,2,4,8,...] × 0.15 mJy beam-1. Galaxies for which spectra were obtained are marked with red circles, see also Table 3 and Fig. 2. The spiral pattern (yellow contours) at the bottom right is due to residual calibration errors around the source B3 0559+422A.
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