Measurements (symbols) and calculations (solid lines) of Rydberg EIT-AT spectra as a function of the coupling laser detuning Δ_c for fixed Ω c = 2 π × 2.06 MHz and Ω RF = 2 π × 7.73 MHz at two different probe Rabi frequencies (a) Ω p / 2 π = 3.93 MHz and (b) 4.51 MHz. The deviation D_Err is obtained with the ratio ( γ AT − Ω RF ) / Ω RF . The bottom panel shows the residuals R between the measured and calculated EIT-AT spectra, and the RMS values of residuals are (a) 0.063 and (b) 0.050.