Four modes, the ``mosaic mode'', the ``pn modified timing'' (compare 5.8.6), the ``RGS multi-pointing'' and the ``RGS small window'' mode, may be considered for individual observations on a best effort basis. 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 modes is recommended in general nor can be fully supported by the SOC. Furthermore, ``mosaic mode'' can not be requested for anticipated ToO's.
Scientists can apply for these modes by selecting the corresponding ``Prime Instrument'' and ``Observing Mode'' in RPS. As such observations require careful manual planning, commanding and coordination, it is mandatory that the proposer asks for ``Fixed-Time'' observations in RPS, see 5.7.1. The evaluation of the success of these observations (8.4) may differ from the evaluation of observations performed with standard instrument modes.