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Fig. 17
Two hours spectra of comet C/2001 Q4 obtained with the ESO VLT. These spectra are the most distant detection of [OI] lines in a comet (at 3.7 AU). The lines are well detected and well separated from the telluric line. The width of the green and the red lines are the same.
This figure is made of several images, please see below:
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