Fig. 6
Surface brightness vs. visual extinction in LDN 1642. The relationships are shown from bottom to top for: 3500 Å (u) (black dots), 3840 Å (magenta, shifted by +20 units), 4160 Å (black dots, +40 units), 4670 Å (b) (blue dots, +60 units), 5470 Å (green dots, +80 units), and 7478 Å (i) (red dots). The crosses at AV = 0.27 mag indicate the zero level for each surface brightness band.
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