In section “Procurement object criteria, Quality criterion” criterion number 40 has been changed. Original information: “40. A direct photon-counting detector (e.g HPAD), Yes 30 p, Nº 0 p. Modified information: ”40. A direct photon-counting detector or equally accurate other photon-counting detector for stable measurement of weak and strong reflections, Yes 20 p, nº 0 p” Also added following information regarding criteria 40: “40.1 Detector sensitivity and dynamic range matching to the relevant direct photon-counting technology (HPAD) should be documented. At least the following data should be provided for the detector: 1) dynamic range; and 2) photon counting efficiency as a function of reflection intensity for the whole range of intensities; and 3) dead-time / readout time / rate.”