Table 1: Table showing sightline data for $\lambda $8037 observations. For the EB-V values, B-V photometry are from Perryman & ESA (1997) and spectral types from the modal averages of all data referenced in the SIMBAD database (URL: http://simbad.u-strasbg.fr/sim-fid.pl); intrinsic stellar photometry is from Wegner (1994) with the exception of Cyg OB2 5 and 8a for which photometry was taken from Massey & Thompson (1991) and Cyg OB2 12 which is of uncertain spectral type and photometry as discussed by Gredel & Munch (1994). Approximate stellar distances d (accurate to around $\pm $50%), were calculated from the spectral types and absolute magnitudes of Wegner (2006) (stellar apparent magnitudes were dereddened assuming a ratio of visual to selective extinction ($R_{\rm V}$) of 3.1).
Target Sp. type V EB-V d (pc)
Cyg OB2 5 O7 Ie 9.2 1.94 700
Cyg OB2 8a O6 I 9.0 1.59 1000
Cyg OB2 12 B2 I-B8 Ia 11.4 2.8-3.4 600
HD 168112 O5 8.6 1.01 2000
HD 169034 B5 Ia 8.2 1.3 1100
HD 183143 B7 Ia 6.9 1.24 650
HD 186745 B8 Ia 7.1 0.96 1600
HD 229196 O5 8.6 1.22 1100
$\lambda $ Cyg B5 V 4.6 0.04 50
$\zeta$ Peg B8.5 V 3.4 0.00 50


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