Table 7: NH₃ production rates and abundances relative to H₂O.
Comet Epoch $Q(\hbox{NH}_3)$ $Q(\hbox{H}_2\hbox{O})_r$ [NH₃]/[H₂O]

[10²⁶ s^-1] [10²⁹ s^-1]

C/2001 A2-B (LINEAR) 7.22 Jul. 1.8 0.28 $\leq$ 0.63%

153P/Ikeya-Zhang 25.42 Apr. 6.4 1.0 $\leq$ 0.63%

C/2001 Q4 (NEAT) 14.11 May 2.7 2.1 $\leq$ 0.13%

C/2002 T7 (LINEAR) 11.64 May 23 3.1 $\leq$ 0.74%

**Table 7:** NH₃ production rates and abundances relative to H₂O.
Comet	Epoch	$Q(\hbox{NH}_3)$	$Q(\hbox{H}_2\hbox{O})_r$	[NH₃]/[H₂O]
		[10²⁶ s^-1]	[10²⁹ s^-1]
C/2001 A2-B (LINEAR)	7.22 Jul.	1.8	0.28	$\leq$ 0.63%
153P/Ikeya-Zhang	25.42 Apr.	6.4	1.0	$\leq$ 0.63%
C/2001 Q4 (NEAT)	14.11 May	2.7	2.1	$\leq$ 0.13%
C/2002 T7 (LINEAR)	11.64 May	23	3.1	$\leq$ 0.74%

Source LaTeX | All tables | In the text

	1 Introduction
	2 Ammonia line observations
	3 Hydroxyl line observations
	4 Upper limits on NH₃ column densities and production rates
	5 Ammonia-to-water ratio
	6 Conclusions
	References