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Observations were made with the spectrograph CARELEC (Lemaître et al. 1989), attached to the OHP 1.93 m telescope. The resolution, as measured on the night-sky lines, was $\sim$ 3.4 Å for the blue and $\sim$ 3.5 Å for the red spectral regions; the spectral ranges were $\lambda\lambda$4780-5780 Å and $\lambda\lambda$6175-7075 Å, respectively. The slit width was 21. Our spectra were flux calibrated using the standard stars EG 247 (Oke 1974) and Feige 66 (Massey et al. 1988), also used to correct the red spectrum for the atmospheric B band at $\lambda$6867 Å.