All Figures

	Figure 1: Colour-colour diagrams for giant stars. a) (U-B)0 vs. (R-I)0 locus and b) (B-V)0 vs. (R-I)0 locus. Solid circles are active single-lined binary giants and open circles are inactive giants. The solid lines are the loci from Caldwell et al (1993) and from Schmidt-Kaler (1982) and the dashed lines are from Alonso et al. (1999) ( ).
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In the text

	Figure 2: (U-B)0 (upper panel) and (B-V)0 (lower panel) "anomalies'' versus (R-I)0. Colour differences computed from the loci of Caldwell et al. (1993) and Schmidt-Kaler (1982). Symbols are as in Fig. 1.
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In the text

	Figure 3: (U-B)0 (upper panel) and (B-V)0 (lower panel) excess versus (R-I)0. Colour differences computed from the loci of Alonso et al. (1999) ( ). Symbols are as in Fig. 1. Two stars with uncertain extinction corrections have been removed from the plot.
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In the text