Corbet diagram with markers indicating super-orbital type. Left: Spin period versus orbital period as proposed using X-ray data. Right: Spin period versus best optical period for the 24 sources with both measured spins and confident periodicities (Sect. 5.2). We exclude non-BeXRB SMC X-1, which has the shortest spin and orbital periods. Of the eight sources present in both panels, three (Sources 23, 41, and 42) have significant differences between the two potential orbital periods.