Other Spectral Range


The terminology other refers here to other spectral range, rather than other spectral line. SWAS "receiver 2" (92.3 GHz LO frequency) was normally tuned to observe 13CO at 551 GHz and H2O at 557 GHz in the lower and upper sidebands, respectively. When it was tuned to the ortho-H218O 1(10)-1(01) line at 549 GHz in the lower sideband, the upper sideband was tuned to a frequency range that contains no known lines. The SWAS project distributed these other spectral range data for completeness.