|  |  | SiCC -- Basic facts Observations 
  |  | Thaddeus et al., 1984, ApJ, 283, L45 Observed SiCC lines from 93 to 170 GHz using NRAO 11m and Bell Laboratory 7m telescopes.
 They found that the rotational constants determined from observations are different from that
 determined from laboratory measurements.
 The found Trot=10K within Ka ladders,
    Tkin=140 K across Ka ladders
 Assume a source size of 50" for SiCC, they derived column density N(SiCC) = 1.5 x 10^14 cm-2
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