Table 2. Summary of the key parameters for the focusing optics – the K-B mirror.

Surface profile	Elliptical cylinder
Substrate material	Quartz
Surface coating	Bare for lower than 10 keV
	Rhodium for higher than 10 keV
Mirror size	600 mm × 50 mm × 50 mm (L × W × H)
Effective mirror area	588 mm × 22 mm (L × W) for vertical focusing mirror
	581 mm × 21 mm (L × W) for horizontal focusing mirror
Grazing incidence angle	2.6 mrad
Focal length	5.955 m for vertical focusing mirror
	5.365 m for horizontal focusing mirror
Spatial acceptance	1.53 mm for vertical focusing mirror
	1.51 mm for horizontal focusing mirror