Table 6: Summary of the upper limits for the quantitative errors.
Variation of varied by Upper limit for the error

factor of Q(C₂H₂) Q(C₂H₆) Q(C₃H₄)

Abundance of $\rm H_2O$ 2 10% 10% 5%

$\rm CO$ and $\rm CO_2$ abundance 50% 20% 20% 10%

Abundance of minor species 10 5% 5% 5%

C₂H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ + $\rm H_2$ 5 10% 10%

C₂H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2H$ +H 5 5% 5%

$\rm C_2H$ + ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ +H 5 5% 5%

C₂H₂+e $\; \rightarrow \;$ $\rm C_2$ + $\rm H_2$ 10 10% 10%

C₂H₂+e $\; \rightarrow \;$ $\rm C_2H$ +H 10 20% 20%

C₃H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_3$ + $\rm H_2$ 5 30%

$\rm C_3$ + ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ +C 5 30%

C₃H₄+e $\; \rightarrow \;$ $\rm C_3$ + $\rm H_2$ 10 50%

Remaining reaction rates - 5% 5% 5%

Fit on profile - 5% 5% 5%

Error on spatial profiles - 10% 10% 10%

**Table 6:** Summary of the upper limits for the quantitative errors.
Variation of	varied by	Upper limit for the error
	factor of	Q(C₂H₂)	Q(C₂H₆)	Q(C₃H₄)
Abundance of $\rm H_2O$	2	10%	10%	5%
$\rm CO$ and $\rm CO_2$ abundance	50%	20%	20%	10%
Abundance of minor species	10	5%	5%	5%
C₂H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ + $\rm H_2$	5	10%	10%
C₂H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2H$ +H	5	5%	5%
$\rm C_2H$ + ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ +H	5	5%	5%
C₂H₂+e $\; \rightarrow \;$ $\rm C_2$ + $\rm H_2$	10	10%	10%
C₂H₂+e $\; \rightarrow \;$ $\rm C_2H$ +H	10	20%	20%
C₃H₂+ ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_3$ + $\rm H_2$	5			30%
$\rm C_3$ + ${\it h}\nu$ $\; \rightarrow \;$ $\rm C_2$ +C	5			30%
C₃H₄+e $\; \rightarrow \;$ $\rm C_3$ + $\rm H_2$	10			50%
Remaining reaction rates	-	5%	5%	5%
Fit on profile	-	5%	5%	5%
Error on spatial profiles	-	10%	10%	10%

Source LaTeX | All tables | In the text

	1 Introduction
	2 The coma chemistry model
	3 Coma profiles used for the analysis
	4 The chemistry of possible C₂ and C₃ parents
	5 The main chemical reaction network for the formation of C₂ and C₃
	6 Model input: the nucleus - properties and composition
	7 Deriving the production rates
	8 Production rates for C₂H₂, C₂H₆ and C₃H₄
	9 Error discussion
	10 Abundance ratios relative to water and carbon monoxide
	11 Abundance ratios relative to acetylene
	12 Clues on the formation region of comet Hale-Bopp
	13 Summary
	References
	Online Material