XMM-Newton Users Handbook Multiple rotations of the filter wheel

With prior approval by OTAC (see § 3.5.3), it is possible to perform a series of exposures where a filter sequence is repeated, e.g. 'U , UVW1 , UVM2' - 'U , UVW1 , UVM2'- 'U , UVW1 , UVM2',...

The recommended configuration is Science User Defined mode with one window in Image mode and possibly an additional Fast mode window. The minimum exposure time will be 800 s except if Fast mode, which requires a minimum exposure time of 1200 s, is used (see section

European Space Agency - XMM-Newton Science Operations Centre