Visual extinction vs. distance estimates, colored as follows: blue shows spectroscopically confirmed Berkeley 87 members, orange shows photometric candidates for Berkeley 87 membership according to Turner & Forbes (1982), magenta shows additional stars of known spectral types, black shows sources that were not previously cataloged, and gray is explained below. Objects whose A_V values are obtained in Sects. 4.1 and 4.2 are shown as crosses and diamonds, respectively. The Berkeley 87 distance and A_V range are represented as a green rectangle. The extinction along the Berkeley 87 direction according to the Stilism map is drawn as a solid black curve. The errors are shown as dotted lines. The dashed red curve is the cumulative distribution (see the scale on the right axis) for the sample of 737 objects with valid distance results, i.e., those that fulfill 0 < f_ϖ ≤ 0.2. The gray data point is not part of this sample and is only included to illustrate the effects of relaxing the f_ϖ constraints (see text).