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Fig. 4


Rotation diagram for CH3OH lines in comet C/2002 T7 (LINEAR) which includes 1-σ uncertainties. The natural logarithm of the column density of the upper level divided by its degeneracy is plotted against the energy of the upper level of each transition for the AOSA (blue circles), AOSB (red squares) and CTSB (black triangles). The solid line shows the best linear fit with a derived rotational temperature given by the inverse of the slope of 119(34)   K to the lines detected by all the spectrometers with S/N greater than three.

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