Astronomy & Astrophysics

Table 1: Definition of the active optical elements in FLASH (f is the focal length, e the eccentricity, and c the linear eccentricity of the individual mirror).
Name Type f [mm] e c [mm]

M1 elliptic 833.0 0.71 1190.4

M2 hyperbolic 383.0 2.0 435.9

P460 parabolic 20.74 1.0 $\infty$

P810 parabolic 17.29 1.0 $\infty$

**Table 1:** Definition of the active optical elements in FLASH (f is the focal length, e the eccentricity, and c the linear eccentricity of the individual mirror).
Name	Type	f [mm]	e	c [mm]
M1	elliptic	833.0	0.71	1190.4
M2	hyperbolic	383.0	2.0	435.9
P460	parabolic	20.74	1.0	$\infty$
P810	parabolic	17.29	1.0	$\infty$

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