``Open Time'' proposers may apply to use any of the instrument modes described
in the XMM-Newton Users' Handbook.
Three modes, the ``modified mosaic mode'', the ``RGS multi-pointing'' and the
``pn modified timing'', may be considered for individual observations on a best
effort basis upon request of the PI.
The Project Scientist can approve observations using these modes if the proposer
can demonstrate the need and, if required, can ensure proper calibration and data analysis.
None of the three modes is recommended in general nor can be fully supported by
the SOC.
Scientists can apply for these three modes by selecting the corresponding ``Prime Instrument'' and ``Observing Mode'' in RPS. As such observations required careful manual planning, commanding and coordination, it is mandatory that the proposer asks for ``Fixed-Time'' observations in RPS, see 5.4. The success of observation evaluation (8.4) may differ from the evaluation of standard instrument modes.