Other tips

* PHT05 or PHT25 observations in raster mode are not possible. To absolutely
  calibrate extended sky emission (e.g. a large cloud) which is observed
  using PHT03 in raster mapping mode, it is recommended to include a PHT05
  observation on one of the PHT03 raster positions. Similarly, PHT25 can be
  combined with a PHT22 raster map or a PHT32 map.

* To absolutely calibrate extended sky emission one can also combine
  absolute photometry AOTs with sparse maps AOTs: PHT05 with PHT17/18/19
  or PHT25 with PHT37/38/39.

* Solar System Objects can be observed with PHT05 and PHT25

* Detection of faint point sources on top of a brighter sky background should
  be done using PHT03 and PHT22, respectively. We refer to Detection 
  limits and observing strategy for very faint point sources for detailed
  information. However, accurate photometric calibration of the point source
  can be achieved with an additional observation of the background level using
  an absolute photometry AOT in the same filterband.

* In case several PHT05 or PHT25 observations with the same detector
  and different filters are performed consecutively, one dark measurement
  at the beginning of the sequence is sufficient to determine the dark signal
  for several filters. The straylight level, however, is filter dependent and
  should be repeated for each filter if necessary.

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