Table 1: OAN errors in the instrumental system and colour indices of the comparison stars in the standard system (season 2003).
Season Filter u Filter v Filter b Filter y

OAN 2002 0.031 0.012 0.008 0.008

OAN 2003 0.024 0.005 0.006 0.006

Star V ( $\sigma_{V}$ ) (b-y) ( $\sigma_{b-y}$ ) m1 ( $\sigma_{m1}$ ) c1 ( $\sigma_{c1}$ )

C1 7.394 (20) 0.583 (11) 0.326 (28) 0.346 (45)

C2 7.358 (20) 0.291 (11) 0.144 (28) 0.473 (45)

C3 6.729 (20) 0.097 (11) 0.282 (28) 0.563 (45)

**Table 1:** OAN errors in the instrumental system and colour indices of the comparison stars in the standard system (season 2003).
Season	Filter u	Filter v	Filter b	Filter y
OAN 2002	0.031	0.012	0.008	0.008
OAN 2003	0.024	0.005	0.006	0.006
Star	V ( $\sigma_{V}$ )	(b-y) ( $\sigma_{b-y}$ )	m1 ( $\sigma_{m1}$ )	c1 ( $\sigma_{c1}$ )
C1	7.394 (20)	0.583 (11)	0.326 (28)	0.346 (45)
C2	7.358 (20)	0.291 (11)	0.144 (28)	0.473 (45)
C3	6.729 (20)	0.097 (11)	0.282 (28)	0.563 (45)

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Analyses
	4 Determination of global atmospheric properties
	5 Conclusions and future work
	References