H I distribution of HCG 16-LSB1. Upper panels: velocity channel maps corresponding to high (light blue) and low (black) resolutions of the H I emission plotted over a high contrast g + r optical image. The beam size for both resolutions is placed in the upper left corner (see text). We note that the H I emission in the plotted velocity channels is not associated with the bright galaxies (HCG 16a and HCG 16b) south of HCG 16-LSB1 (see Fig. 1). Bottom panel: H I spectrum obtained from the channels (high resolution data) presented in the upper panel (i.e., integrated over HCG 16-LSB1; see Sect. 2.2 for details). The peak emission is fitted with a Gaussian function.