Inclinations as a function of the secondary mass for all the SB1 systems, where no spectroscopic signatures of the secondaries were found. These diagrams were computed using the evolutionary masses and the radii estimated with BONNSAI. The vertical solid line indicates the minimum masses of the unseen companions, and the dashed lines show the error bars on those values. The horizontal solid line indicates the minimum inclination of the systems, and the horizontal dashed lines show the error bars on the minimum inclinations. The orange shaded regions correspond to the possible values for the system inclinations and masses of the unseen objects. The dashed red lines indicate the error bars on the binary mass function and are computed by propagating the 1σ errors on the other parameters. (a) Cyg X-1. (b) HD 12323. (c) HD 14633. (d) HD 15137. (e) HD 37737. (f) HD 46573. (g) HD 74194. (h) HD 75211. (i) HD 94024. (j) HD 105627. (k) HD 130298. (l) HD 165174. (m) HD 229234. (n) HD 308813. (o) LS 5039.