  A simple regularity in anticipating P-wave excitation energies of states with
heavy quarks is noted. It can apply to systems such as the negative-parity
$\Sigma_c$, $\Sigma_b$, and $\Omega_c$, $\bar Q Q$ quarkonia, and the
bottom-charmed meson $B_c$. When one subtracts a term accounting for
phenomenological energies of heavy quarks binding with one another in S-waves,
the residual excitation energies display an approximately linear behavior in
the reduced mass of constituents, all the way from the $\Lambda$ to the
$\Upsilon$.
