Standard Spectrograph Setup

As described above the setup of gratings, which determines the spectrum echelle format, can arbitrarily be determined within the range allowed. However, users are encouraged to use one of the standard spectrum formats for efficiency of observation and data reduction. Standard formats and setups of the HDS are given in Table . Default echelle and detector rotation angles are 0.25 deg (900 asec) and -1 deg respectivelly.

Table 6: Standard setup of the spectrograph and wavelength region

	CCD1 (nm)	CCD2 (nm)	cross disp./ /collimator	cross angle (arcsec (deg))	filter (1,2)
StdUa	310-387	400-476	Blue	17950 (4.986)	Free,Free
StdUb	298-370	382-458	Blue	17230 (4.786)	Free,Free
StdBa	342-419	432-508	Blue	19390 (5.386)	Free,Free
StdBc	355-431	445-521	Blue	20020 (5.561)	Free,Free
StdYa	403-480	494-566	Blue	22090 (6.136)	Free,Free
StdYb	414-535	559-681	Red	15860 (4.406)	Free,KV370
StdYc	442-566	586-705	Red	16630 (4.619)	Free,KV389
StdYd	406-531	549-666	Red	15610 (4.336)	Free,KV370
StdRa	511-631	658-779	Red	18584 (5.163)	Free,SC-46
StdRb	534-659	681-800	Red	19210 (5.336)	Free,SC-46
StdNIRa	750-869	898-1016	Red	25330 (7.036)	OG530,Free
StdNIRb	673-789	812-937	Red	22990 (6.386)	OG530,Free
StdNIRc	617-740	759-882	Red	21490 (5.969)	OG530,Free
StdI2a	498-618	637-759	Red	18130 (5.036)	Free,SC-46
StdI2b	355-476	498-618	Red	14170 (3.936)	Free,Free

For the observations in the longslit mode, one can currently use either of the five available setups. In all cases only the Red CCD is in use, filters are mounted in turret 1, and the cross disperser is replaced by a mirror (the cross angle is set to 0). These setups are summarised in Table .

Table 7: Standard setup and wavelength region for the longslit (narrow band) mode.

	Filter	Centre (A)	Width (A)
StdHe	He4686	4688	28.4
StdO5	O5007	5010	31.7
StdO6	O6300	6307	29.7
StdHa	Hα	6580	54.6
StdS6	S6717	6728	42.3