The sky field around the position of B2251+158 (C454.3), as in Fig. 2. The map of reddening at upper left is offset to show a separate peak to the Northwest near 22^H50^M and a profile at the position of this peak is shown at upper right, shaded green and labeled “NW”, along with profiles toward 3C 454.3 (shaded) and at the peak of the small clump that is seen immediately adjacent to the continuum source.