Calculated distances to all CIG galaxies with measurements of recession velocity (white). The subset of the CIG that is the AMIGA HI science sample (defined in Sect. 5.1) is shown in grey, the dark grey indicating detections and light grey the upper limits. Note that the science sample contains no sources with heliocentric velocities less than 1500 km s^-1 due to the isolation requirements, as explained Sect. 5.1.