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Fig. 10

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(B − V) vs. (U − B) color − color diagram for field stars. The solid lines are empirical ZAMS for no reddening (black line) and for E(B − V) = 0.40 (blue line), 0.70 (green line), and 1.00 (red line). The reddening vector is shown as an arrow in the topright corner. The position of a few spectral types is indicated to guide the eye. Stars crowding along the various ZAMS are depicted with empty squares, colored in the same way as the corresponding ZAMS. See text for more details.

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