**Table 1:** Mean AAVSO magnitudes for the AM Her observations used in this paper. The date is for the start of exposure. H and L refer to high and low states, respectively.
Instrument	Date	Exp (ks)	State	Magnitude $^{\dagger}$	Ref.
ROSAT PSPC	1991-04-12	11.6	H	$13.0\pm0.2$	(1)
PSPC	1991-09-15	30.6	L	15.0
HRI	1996-01-26	2.3	H	13.2
EUVE	1993-09-23	74.0	H-	$13.5\pm0.2$
	1995-03-08	121.0	H	$13.1\pm0.2$
HUT	1995-03-09	6.7	H	$13.1\pm0.2$	(2)
Chandra LETG	2000-03-09	24.0	H	$13.3\pm0.2$	(3)

$^{\dagger}$ The ``magnitude'' is the average of the AAVSO readings over the duration of the observation and the ``error'' is their standard deviation.
References: (1) Gänsicke et al. (1995), (2) Greeley et al. (1999), (3) Burwitz et al. (2002), Trill (2006).

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