left-handed bottom, leading to tension in the choice of $c$ for $Q_3$) in order to cancel the leading contribution to the $S$ parameter from the weak boson KK modes. With this setup, and the additional suppression of the $T$ parameter from a custodial $SU(2)$, masses of the KK modes of around $3$ TeV are roughly consistent with precision measurements.

Specifically, we consider $c_{t_R} \sim  0$, $c_{Q_{3L}} \sim 0.4$, and all others $c_f \lesssim -0.5$. As we will see shortly, the physics we study does not depend strongly on $c$ once it is $< -1/2$, so the specific values for light fermions are not important. The choices of $c$ specify the fermion zero mode wave functions, and we compute the couplings of the first KK gluon to the fermion zero modes as the integral over the wave functions. The light quarks all have very similar couplings of roughly $g_{f} \simeq -g_S / 5$, the third family left-handed quarks $g_{Q3} \simeq g_S$, and the right-handed top quark $g_{t} \simeq 4 g_S$, where $g_S$ is the strong coupling constant which characterizes the coupling of the gluon zero mode.

IR Brane Kinetic Terms
----------------------

An alternate way to render precision electroweak data consistent with 