Scatter plot showing the relationship between the orbital period of a binary pulsar system and the mass of the companion, for different types of companion, all with known masses, obtained from version 2.7.0 of the ATNF pulsar catalog. The shaded region is the expected relationship between the orbital period and the mass of an He WD for the different types of progenitors as described in T. M. Tauris & G. J. Savonije (1999). The minimum companion mass of PSR J0125−5854 is plotted as a black arrow.