Measurement of Ω₀ obtained by scanning the RF drive frequency of clock 2. To reduce the measurement statistical uncertainty of Ω₀, we repeated this scanning randomly from 24.7 MHz to 24.95 MHz 15 times. Fifteen scans were recorded (data shown as black squares). The corresponding weighted mean of Ω₀ is shown by the red circle. The inset shows the data taken in one of the scans and a linear fit through the data as shown in Fig. 8. and obtained the result of Ω₀ = 2π × 24.801(2) MHz.^[15]