Table 6: Gas temperature measurements or collision rate constraints.
UT date $\langle r_{\rm h}\rangle$ Molecular lines Temperature [K] $x_{\rm ne}^1$
[mm/dd.dd] [AU]   Rotational Kinetic1  
C/1999 T1 (McNaught-Hartley) (2001)  
01/06.67 1.233 CH3OH 304/307 GHz $\rm 52^{+36}_{-16}$ $\rm 60^{+40}_{-20}$  
01/30.6-31.2 1.395 HCN(3-2)/(1-0) $21.1\pm2.6$   $1.2\pm0.4$
01/31.2-31.2 1.398 HCN(3-2)/(1-0) $19.4\pm2.0$   $0.55\pm0.2$
01/30.5 1.400 CH3OH 157 GHz $39\pm 6$ $38\pm 6$  
02/05.7-06.1 1.448 HCN(4-3)/(3-2) $32\pm7$   $\rm 1.4^{+1.8}_{-0.8}$
C/2001 A2 (LINEAR) (2001)  
06/11.7 0.855 CH3OH 157 GHz >62 >50  
06/12.8 0.863 CH3OH 145 GHz $37\pm26$   <1.1
07/08.2 1.143 HCN(3-2)/(1-0) $38\pm 5$   $\rm0.6^{+0.4}_{-0.3}$
07/08.23 1.144 CH3OH 157 GHz $56\pm 5$ $51\pm 5$  
07/10.2 1.169 HCN(3-2)/(1-0) $50\pm 6$   $\rm 1.8^{+0.9}_{-0.6}$
C/2000 WM1 (LINEAR) (2001)  
11/24.0 1.343 HCN(3-2)/(1-0) $23.7\pm2.3$   $0.3\pm0.2$
11/24.8 1.329 HCN(3-2)/(1-0) $\rm 58^{+21}_{-13}$   $\rm 14^{+18}_{-10}$
11/25.4 1.320 CH3OH 157 GHz $56\pm 7$ $50\pm 6$  
11/25.8 1.313 HCN(3-2)/(1-0) $23.0\pm2.7$   $\rm0.2^{+0.15}_{-0.1}$
12/03.36 1.191 CH3OH 304/307 GHz $\rm 36^{+9}_{-7}$ $\rm 35^{+9}_{-7}$  
12/05.0 1.165 CH3OH 242 GHz $74\pm35$ $150^{+\infty}_{-80}$  
12/07.7 1.121 HCN(4-3)/(3-2) $\rm 51^{+9}_{-7}$   $\rm 1.5^{+1.3}_{-0.7}$
12/08.0 1.116 CH3OH 304/307 GHz $\rm 48^{+18}_{-11}$ $\rm 46^{+17}_{-10}$  
153P/Ikeya-Zhang (2002)  
03/20.52 0.508 CH3OH 157 GHz $99\pm43$ $75\pm35$  
03/20.6 0.508 HCN(3-2)/(1-0) $\rm 67^{+16}_{-11}$   $\rm 1.4^{+1.8}_{-0.9}$
04/25.59 0.977 CH3OH 251 GHz $59\pm 5$ $72\pm 6$  
04/27.64 1.011 CH3OH 251 GHz $87\pm13$ $114\pm20$  
04/29.30 1.039 CH3OH 157 GHz $62\pm 4$ $54\pm 4$  
04/30.2 1.055 HCN(3-2)/(1-0) $40\pm 3$   $\rm0.9^{+0.3}_{-0.2}$
05/09.85 1.217 CH3OH 157 GHz $40\pm 7$ $37\pm 6$  
05/11.34 1.242 CH3OH 157 GHz $35\pm 7$ $32\pm 6$  
05/12.0 1.253 HCN(3-2)/(1-0) $31\pm 2$   $0.9\pm0.2$
05/12.08 1.254 CH3OH 220/254 GHz $\rm 57^{+13}_{-8}$ $59\pm10$  
1 A constraint on $x_{\rm ne}$ (see text) is given for observations that do not constraint
the kinetic temperature but rather the collision rate.

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