Table 1: Sources of spectroscopic observations: 1 - Observatory; 2 - code assigned to each combination of telescope + equipment used throughout this paper; 3 - telescope aperture and spectrograph; 4 - projected spectrograph entrance apertures (the first number is the slit width, and the second is the slit length); 5 - focus of the telescope.
Observatory Code Tel. and equip. Aperture Focus

SAO(Russia) L(N) 6 m+Long slit 2.0 $\times$ 6.0 Nasmith

SAO(Russia) L(U) 6 m+UAGS 2.0 $\times$ 6.0 Prime

SAO(Russia) L(S) 6 m+Scorpio 1.0 $\times$ 6.0 Prime

Gullermo Haro(México) GH 2.1 m+B $\&$ C 2.5 $\times$ 6.0 Cassegrain

San-Pedro(México) S-P 2.1 m+B $\&$ C 2.5 $\times$ 6.0 Cassegrain

SAO(Russia) L1(G) 1 m+GAD 4.2(8.0) $\times$ 19.8 Cassegrain

SAO(Russia) L1(U) 1 m+UAGS+CCD2K 4.0 $\times$ 9.45 Cassegrain

**Table 1:** Sources of spectroscopic observations: 1 - Observatory; 2 - code assigned to each combination of telescope + equipment used throughout this paper; 3 - telescope aperture and spectrograph; 4 - projected spectrograph entrance apertures (the first number is the slit width, and the second is the slit length); 5 - focus of the telescope.
Observatory	Code	Tel. and equip.	Aperture	Focus
SAO(Russia)	L(N)	6 m+Long slit	2.0 $\times$ 6.0	Nasmith
SAO(Russia)	L(U)	6 m+UAGS	2.0 $\times$ 6.0	Prime
SAO(Russia)	L(S)	6 m+Scorpio	1.0 $\times$ 6.0	Prime
Gullermo Haro(México)	GH	2.1 m+B $\&$ C	2.5 $\times$ 6.0	Cassegrain
San-Pedro(México)	S-P	2.1 m+B $\&$ C	2.5 $\times$ 6.0	Cassegrain
SAO(Russia)	L1(G)	1 m+GAD	4.2(8.0) $\times$ 19.8	Cassegrain
SAO(Russia)	L1(U)	1 m+UAGS+CCD2K	4.0 $\times$ 9.45	Cassegrain

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