H i column density contours of NGC 3998 and its neighbours, overlaid on the r-band SDSS image. The contours are given by SHi = 2n × 1019 cm-2 (n = 0,1,2,...); the lowest contour corresponds to the detection limit of our observations. The figure is annotated such that blue crosses and labels indicate galaxies with an H i detection in our work, while a red cross and labels indicates galaxies that do not have an associated detection.
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