Observing strategy and detection limit with C_160

Previous test observations  with the C_160 filter (SAO214134 and SAO248381, 
both 23 mJy, and Theta UMi, 46 mJy) have failed to detect the target stars, 
therefore new observations of a somewhat brighter target are necessary.
We propose to observe HR6132 from the GBPP list with C_160, using all four
different observing modes listed in the report 'Detection limits and observing 
strategy for very faint point sources' (SAI/96-188/Doc, Laureijs et al.).
The star has a predicted brightness of 75 mJy at 175 um, and is located at
a very low background environment. The results will help to answer the 
following questions:
- which observing mode provides the best detection limit?
- is the signal of the chopped measurement smaller than the signal derived from
  staring measurement? Is this effect observable in case of P32 oversampled
  maps as well?                        
- does the 2x4 raster provide higher signal than the staring measurement?

UK, RJL 12/09/96