3. Observations

39 of the galaxies from our sample were observed on April, 1995 at the 1.2-m telescope of Observatoire de Haute-Provence (OHP), France. A CCD camera No. 2 Tektronix 1024$\times$1024 pix provided a field of view of $11.8' \times 11.8'$ with a resolution of 0.69''per pixel. B, V and I Cousins filters were used (see the equipment description on http://www.obs-hp.fr). The list of the galaxy exposures is presented in Table 2, where the columns are:

Column 1: galaxy name.

Column 2: date of the observation.

Columns 3, 4 and 5: exposure time (in s) in B, V or I filter, respectively.

Some bias and dark exposures were made every night. Flat fields (twilight sky) were also exposed every evening and every morning.