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Fig. B.1

image

Color (g,r and i band composite) images from the SDSS alongside 21-cm Hi line spectra of galaxies clearly detected at Arecibo. The size of each image is 2× 2 with the NIBLES source number indicated in the upper left corner, absolute z-band magnitude, Mz, in the top center and log(MHI) in M in the top right corner of each image. The vertical axis in the spectra is flux density in mJy, the horizontal axis is heliocentric radial velocity (cz) in km s-1. The SDSS recession velocity is denoted by a vertical dashed magenta line, the mean Hi velocity by the blue triangle, and the W50 line width by the horizontal blue arrow bar. Confused galaxies are denoted by their confusion code from Sect. 4 in the upper right portion of the spectrum. Velocity resolution is 18.7 km s-1.

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