**Table 1:** Water production rate measurements of 46P/Wirtanen.
	Bertaux et al. (1999)	Fink et al. (1998)	Farnham et al. (1998)	Stern et al. (1998)
Instrument	SOHO-SWAN	1.54 m Catalina	1.1 m and 0.8 m at Lowell Obs.	HST-FOS
Method	Ly- $\alpha$	OI¹D (6300 Å)	OH^a	OH
Model	Haser	Haser	A'Hearn (1995)	Vectorial (Festou 1981)
$r_{\rm h}$ range (pre)	1.52-1.07	1.22-1.07	1.14-1.08	2.72-1.31
$r_{\rm h}$ range (post)	1.07-1.35	1.08-1.47	none	none
Accuracy	25%	20%	See footnote b	See footnote b

$^{\rm a}$ We derived $Q_{\rm {H_2O}}$ using $Q_{\rm {H_2O}}=1.3\times Q_{\rm {OH}}$ , as suggested by the authors.
$^{\rm b}$ The accuracy depends on each water production rate measurement (see Fig. 1).

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