Distributions of the orbital parameter of the MONOS II sample. Left panel: eccentricity-period distribution of the MONOS II SB1 sample. Systems in a pre-mass-transfer configuration are marked as blue diamonds, and those that are undergoing a mass-transfer event are marked as orange squares. Systems with a collapsed companion are marked as green circles. The systems marked as unc. in this work are also shown here as red stars. Right panel: minimum secondary mass-period distribution of the MONOS II SB1 sample. The colors are the same as for the upper panel. Cyg OB2-A11 is shown here as a red triangle.