Populated zones in the donor mass (M) – orbital period (P) parameter space. Panel O) shows 447 observations according to BuCat MS (small red squares), BuCat LC (small green diamonds) and BDCat (small blue triangles); large black dots are those observations for which the best-determination is also consistent with SB9Cat. Panels 1)–7) show theoretically populated zones with models 1 through 7, compared to all (small dots) and most reliable (large dots) observations.