Table 3.

Summary of uncertainties

Source of uncertainty	1Sd→2Pc− Doubly spin-polarized (MHz)	1Sd→2Pf− Doubly spin-polarized (MHz)	1Scd→2Pc± Singly spin-polarized (MHz)	1Scd→2Pf± Singly spin-polarized (MHz)
Lineshape fit statistics	55	54	45	47
Fitting-model dependence	24	42	17	62
Wavemeter drift	30	30	30	30
Wavemeter offset	18	18	18	18
730-nm cavity frequency correction	18	18	18	18
Residual 1Sc state atoms in doubly spin-polarized sample	23	16	0	0
Magnetic field	5	8	5	8
Total	76	81	62	88

Estimated uncertainties (1σ) at 121.6 nm for each transition (Methods).