XMM-Newton Announcement of Opportunity: Policies and Procedures

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5.6.6 Additional OM Filter Wheel Rotations

There are scientific questions, which cannot be answered with the standard sequence of OM filter wheel positions. In such cases, the PI has to request multiple filter wheel rotations in the proposal form and to justify them in the scientific justification. Only if explicitly approved by the OTAC, the additional filter wheel rotations will be performed.

European Space Agency - XMM-Newton Science Operations Centre