Beware of our inevitably slightly confusing notation:
is the binary’s orbital frequency and
refers to the
spin-orbit terms therein;
is the precession frequency of the
-th spin while
is the precession frequency of the
orbital plane; and
defined earlier in Eqs. (244) and (284) is the rotation frequency of the
-th black hole. Such
different notions nicely mix up in the first law of spinning binary black holes in Section 8.3; see Eq. (282) and the corotation
condition (285).