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The Cologne Observatory for sub-mm astronomy KOSMA was located on Gornergrat in the Swiss Alps at an altitude of 3200m. Astronomical observations with a 3m diameter radiotelescope in the wavelength range 200-810 GHz have been performed. The telescope was already used for atmospheric line observations, i.e. a long-term monitoring CO project (F. Boes 1994, PhD Thesis, University of Cologne), and HCN observations (Lautie et al. 2008, in prep).

This plot shows the transmission in percent for values of pwv=0.5mm (grey), 1mm (red), and 2mm (blue) against frequency/wavelength for a frequency range 0-2000 GHz. The frequency resolution is 200 MHz.

0-2000 GHz

These plots show the transmission in percent as a solid black line and the modeled spectrum (in brightness temperature [K]) as a grey scale. Atmospheric lines of interest are indicated. The frequency resolution is 20 MHz.

000-100 GHz 100-200 GHz

200-300 GHz 300-400 GHz

400-500 GHz

Gzipped ascii-files of data in two-column format. First column: Frequency in GHz, second column: Transmission (to get opacity take -ln(transmission)).
Frequency [GHz] 0-2000 (df=200 MHz) 0-500 (df=20 MHz)
pwv=0.5mm kosma-0-2000-05
pwv=1mm kosma-0-2000-1 kosma-0-500-1
pwv=2mm kosma-0-2000-2