For irregular galaxies without spiral structure, the average surface brightness is an indicator of absolute magnitude. Their average absolute magnitudes are around -15, but the range in this figure is large. Spirals of intermediate brightness are assigned luminosity classes of II, II-III, III and so on. Brief comments on the presence of multiple nuclei, rings, etc. In general, only a subset of the above fields will be present for any given object.
Positive values indicate recession and negative values indicate approach.
The error associated with the radial velocity, if known. The object redshift. This is the standard magnitude used in major galaxy catalogs such as RC2 and RC3. These may contain alternate object identifications which will occasionally be cryptic. However, since no further explanation for these is offered in the CfA cd-rom documentation, none can be offered here either.