Table 2. Parameters describing the beamline mirrors.

Beam footprints, given as FWHM, on the mirrors are not necessarily round; the given values are to be intended for the respective orientation (e.g. for HFM the beam given footprint is horizontal). Slope error values [root mean square (RMS)] for the tunnel mirrors are from Gerasimova et al. (2022 ▸).

	Distance from source (m)	Clear aperture (w × l) (mm)	Incidence angle (mrad)	Shape	Orientation	Curvature radius (km)	Tangential slope error RMS (nrad)	Beam footprint at hν = 0.5, 1.6, 2.7 keV (mm)
M1	281	20 × 800	9, 13, 20	Planar	H	–	56	6.5, 2.7, 1.9
M2	283.9	20 × 800	9, 13, 20	Spherical (bendable)	H	15.03, 10.40, 6.76	58	6.5, 2.7, 1.9
M3-LEPM	300	20 × 500	20	Spherical (fixed)	V	7.62	63	6.8, –, –
M3-HEPM	300	20 × 500	9	Spherical (fixed)	V	16.49	37	–, 2.9, 2.0
M4	301	20 × 500	9, 20	Planar	V	–	140	6.8, 2.9, 2.0
HFM	444.8	20 × 600	9.15	Elliptical (fixed)	H	0.69	81	5.1, 2.2, 1.5
VFM	446.1	20 × 400	9.24	Elliptical (fixed)	V	0.415	71	3.1, 1.3, 0.9