[@BGR91] is $3.7 \sigma$ away from the other two values, which are both from our laboratory and both of which relied on AOM locking. Ref. [@BGR91] is also the work in which the value in $^{87}$Rb was discrepant by $1.7 \sigma$. The current measurement is consistent with our previous ones. All the values for the $\{ 3-2 \}$ interval are consistent with each other.

  $\{ 4-3 \} $ Interval   $\{ 3-2 \} $ Interval    Reference
  ----------------------- ----------------------- -----------
  120.958(20)             63.436(20)               This work
  120.966(8)              63.424(6)                [@DAN08]
  120.960(20)             63.420(31)               [@RKN03]
  120.506(124)            63.402(93)               [@BGR91]

  : Comparison of measurements of hyperfine intervals in the $5P_{3/2}$ state of $^{85}$Rb to previous results. The last row is calculated from the $A$ and $B$ coefficients reported therein. All values in MHz.

\[t2\]

Measurements in the $6P_{3/2}$ state of $^{133}$Cs
--------------------------------------------------

The next set of measurements was done on the $D_2$ line in $^{133}$Cs at 852 nm. For this, the probe was locked to the $F=4 \rightarrow F'=5$ transition and the pump was scanned either across the $F=4 \rightarrow F'=4$ transition or the $F=4 \rightarrow F'=3$ transition. Representative spectra for the two cases are shown in Fig. \[cs44\]. Lorentzian fits to the spectra yielded the line center and 