... galaxies

Based on observations made at Observatoire de Haute Provence (CNRS), France.

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... determinations

Radial velocities are not reliable distance indicators for nearby galaxies because of possibly large peculiar velocities.

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... width

The profiles in Fig. 3 have been smoothed for plotting, so the error-bars apply to the original un-smoothed SBPs. Also, the calibration uncertainties are not shown in the plots.

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