The following program is carried out in order to consolidate the PHT 
calibration of chopped measurements and derive signal losses due to the high 
chopper frequency compared to signal stabilization time.

- observation of NGC7640: chopped measurements and nodding as reference.


Several filters are taken to have several contrast levels between background
and source. The measurement includes staring and chopped observations  


.HISTORY
10/12/97        JA New version for NGC7640 (C100: 60 and 105um)

.OTT 2639 
.TDT 2179