0.2X0.2 Aperture

Description

The "utility" slit for the echelle gratings. This -slit is the most photometric of the echelle slits and has the highest throughput for photon statistics.

Table 13.23: 0.2X0.2 Throughputs

	% Throughput
1200	54.5
1800	67.2
2400	73.7
3000	77.2
3600	79.6
6000	81.7

Aperture	Projected Length (arcsec) (MAMA E-modes)	Width (arcsec)
0.2X0.2	0.2	0.2

Figure 13.72: 0.2X0.2 Aperture Throughput as a Function of Wavelength