**Table 1:** Spot modelling results.
Year	filter	spot temp. (K)	spot coverage (%)
1984a^a	B, V	$4247\pm145$	14.0
1984b^a	B, V	$4308\pm82$	16.1
1985^a	B, V	$4438\pm56$	23.8
1988^b	B, V	$3611\pm104$	6.2
1996^c	b, y	$3480\pm76$	9.6
1997^c	b, y	$3611\pm198$	10.8

^a Strassmeier et al. (1989); ^b Zhang et al. (2000); ^c present paper.

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