21 cm line profiles of galaxies listed in Table 2. The profiles are classified according to their PGC name which is written above each panel. Ordinate and abscissae axes are graduated respectively in km s^-1 and Jy. The heliocentric radial velocities are expressed in terms of optical redshift . The horizontal line represents the baseline of the profile, i.e. the zero flux level, from which the maximum is estimated. The full figure is available in Appendix A.