FEL beam parameters
===================

===============  ===================
Electron energy  Photon energy range
[GeV]            [keV]
===============  ===================
8.5              0.24--1.08
11.5             0.45--1.98
14.0             0.66--2.94
16.5             0.92--4.08
17.5             1.03--4.59
===============  ===================

From "Photon beam properties at the European XFEL
Saturation Tables (December 2018 revision)" by E.A. Schneidmiller and
M.V. Yurkov.