CMD displaying the results of the mock SED fits for different combinations of hot subdwarf (sdB-black; sdOB-grey; He-sdO-red) with MS companions. Each circle along the tracks indicates a 0.05 M_⊙ step in the companion mass between 0.2 M_⊙ and 3.0 M_⊙ where several have been labelled as reference points. These tracks indicate that a companion mass of 1.0–1.1 M_⊙ is the maximum expected to be detected in this sample. The calculations do not account for reddening and can be compared to the reddening-corrected hot subdwarf composite systems given in the plot. These composites have been divided up into companion types to emphasise that the sample is expected to be complete for all K-type companions. Newly discovered systems are indicated with an additional encompassing pentagon. BD–03 5357 and HD 185510 are outside the plot limits; they are known to host subgiant companions. Queried candidates that will be followed-up in a spectroscopic monitoring campaign are shown as grey plus signs.