XMM-Newton Announcement of Opportunity: Policies and Procedures

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5.8.4 Inappropriate Instrument Modes and Filters

Inappropriate instrument modes and/or optical-blocking filter may lead to “pile-up” and/or “optical loading” of the obtained data and as such diminish the scientific return of the mission. In exceptional cases the Project Scientist can approve the usage of improper instrument modes or optical-blocking filters. Proposers are requested to demonstrate the need and, if required, availability of proper calibration and data analysis techniques or tools in the scientific justification of the proposal.

European Space Agency - XMM-Newton Science Operations Centre