Fig. A.2. The color index vs. for barium stars (open squares: Ba0 - Ba1, open triangles: Ba2 - Ba3, filled circles: Ba4 - Ba5). The loci of main sequence stars (class V), subgiant stars (class IV), giant stars (class III) and supergiant stars (class Ib), as provided by McClure & Forrester (1981), are indicated by the various lines. Small dots correspond to 131 G - K giants common to the samples of McClure & Forrester (1981) and McWilliam (1990), as plotted in Fig. A.1. Double-circled and single-circled symbols identify the same stars as in Fig A.1. The arrow corresponds to a reddening by