that were too peculiar or had too short gas extensions to enter the T-F analysis also present misalignments between the kinematic and photometric axes (HCG 16b, 16d, 10c, 100b).

Similar results are obtained when comparing the kinematic PA’s to the corresponding photometric values derived from either R1991 and/or N2000 for the smaller subsample of galaxies in common (comparing columns 4 and 8 and columns 4 and 10 of Table 2).

We are not able to make a direct comparison between the centers we measure with those measured by R1991 and/or N2000 since we do not know the exact value they used (this problem is related to the fact that we do not have information from our Fabry-Perot data about the systemic velocities of the galaxies, given the scanning nature of the instrument, Amram et al. 1992, and also related to the fact that we do not know exactly where they positioned the slits). We then list in column 6 of Table 2 only the difference in arcsec between the measured kinematic and photometric center. The center of the continuum image was taken as the point of maximum intensity. The center of the velocity field was chosen to be a point 