Last revised:  	30/7/97

	Telescope:
	Dtel		=	4m, f/11
	Filter BP	= 	40A
	Seeing		= 	0.8"

	CCD:
	pixel size	= 15um
	area		= 4k x 2k
	ron		= 6e

	Instrument:
	
	Similar layout to Strawman design but with two
	1200g/mm gratings operating near-littrow

	efficiency	=	0.36  (unchanged)
	Dcoll		=	120mm (collimated beam size)
	dispersion	=	2.03 pxl/A 
	scale		=	2.565 pxl/arcsec (dispersion direction)
			=	2.565 pxl/arcsec (spatial direction)
	field		=	13.3 x 13.3 arcmin
	PSF		=	2.17 pxl (dispersion direction, including 0.35A intrinsic width)
			=	2.05 pxl (spatial direction)

	Background:
	sky		= 21.4 mag/arcsec2
	galaxy		= 21.8 mag/arcsec2 (near centre)
	
	total		= 21.1 mag/arcsec2 (sky + 0.5 galaxy is taken as
				appropriate for part of the image not too
				close to the galaxy centre)

	Fluxes:

	PN*		= 1.3 10-15  erg/cm2/s at D = 3.3 Mpc (brightest PN)

	Typical Observation:

	D		= 20 Mpc
	N(obs)		= 14
	T(integration)  = 2,000s

	Counts for PN*	= 5363 (per arm)
	Background	= 12687 (per pixel, each arm)

	Science goals:

	Detection as complete as possible in the brightness range
	PN* to  (PN* + 2.5mag)

	Radial velocities to (1sigma) accuracy of 20km/s 
	in the brightness range (PN* + 2.0mag) -- i.e.
	sigma is 28 km/s in each arm.