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Fig. 7

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On-the-fly map of the HCN J = 3–2 emission in comet C/2006 P1 (McNaught) obtained with the IRAM 30-m on 15.65 January 2007 (4 min integration time). The de-pixelized image shows the line area between −3 and +3 km s-1, contour levels are 2 and 4σrms. The cross marks the comet position as computed from the reference ephemeris. Before gridding to beam/2 sampling, a linear spatial baseline was subtracted from each on-the-fly subscan to remove total power fluctuations of mainly atmospheric orgin.

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