Predicted properties of OB stars that have BH companions with measurements of all dynamically confirmed OB + BH systems in the local group and of the WR + O systems in the SMC. The main panels shows the number of systems in the rotational velocity-velocity semi-amplitude plane (first column, second row), orbital period-velocity semi-amplitude plane (second column, second row), and eccentricity-velocity semi-amplitude plane (second column, third row) in logarithmic colouring and the other panels are projections of that onto one axis, i.e. the distribution of OB rotational velocities (top left), orbital periods (top centre), OB star velocity semi-amplitudes (centre right), and eccentricities (bottom right), where emission-lines stars are marked by white dots.