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Figure: Fragment of the echelle spectrum of protoplanetary nebula RAFGL 618 in H${_\alpha}$

In Fig. 3 are shown fragments of the echelle spectra of the quasar S5 0014+81 ($m_{\rm V}=16.5$) obtained with the PF echelle spectrograph within the frames of the programme of study of absorption spectra of bright quasars (authors of the programme are D.A.Varshalovich and A.V.Ivanchik). The total length of the echelle spectrum recorded simultaneously is about 4000 Å. To compare with the level achieved previously one can use Fig. 4 from the paper by Varshalovich et al. (1996), where a spectrum of the same object (100Å long), recorded in the BTA MSS observations carried out under the same seeing conditions in 1994, is given. It should be noted that apart from the gain in the number of simultaneously transmitted spectrum elements under the conditions of retaining the spectral resolution, the PF echelle spectrometer increased the limiting magnitude in high spectral resolution observations of faint objects.

In Fig. 4 is presented an echelle spectrum fragment of the protoplanetary nebula RAFGL 618 (IRAS 04395+3601, $m_{\rm V}=17$), which was recorded in carrying out the programme of spectroscopy of ``post-asymptotic giant branch'' objects (author of the programme is V.G. Klochkova).