Caption: Athena/WFI effective on-axis area (with and without Filter Wheel Optical Blocking Filter) compared to XMM-Newton/EPICpn (medium filter) and Chandra/ACIS-I. The Athena/WFI curve assumes an SPO optics with 15 mirror rows, 2.3 mm rib pitch, and Ir+B4C coating.

Creation date: October 2018.

Credits: A.Rau/WFI Team.