$ > 100 kHz) and optimal regions are quite narrow, indicating the sensitivity of the CP experiment on the power level settings. The RF amplitude conditions for the OPTIANS are shown in Figure . The range of optimal RF amplitudes is broad, making the pulse sequence forgiving to power-level fluctuations and RF inhomogeneity. The simulations indicate that the matching condition of the OPTIANS is attained when the RF amplitudes on the two channels are approximately equal. Moreover, the performance starts lowering for 𝜈 . $ , 𝜈 . &' > 90 kHz. Note that the upper limit to the RF amplitudes, (𝜈 . $ , 𝜈 . &' ) was set to (90 kHz, 80 kHz) in the optimizing simulations. Simulated efficiency as a function of the MAS frequency is shown in Figure . Though the OPTIANS was generated for a MAS of 42 kHz at 9.4 T magnetic field, it exhibits optimal performance within the MAS range of 37 kHz ≤ 𝜈 -≤ 47 kHz. Moreover, the efficiency remains high in a broad range of range of 30 kHz ≤ 𝜈 -≤ 70 kHz, making it suitable for applications in a wide MAS regime. At 14.1 T, the optimal MAS frequency region is shifted towards fast frequencies, but the profile is broader 40 kHz ≤ 𝜈 -≤ 100 kHz than the 9.4 T case. The effect of RF offset on the OPTIANS is shown in Figure . The numerical simulations of the offset profile performed at 14.1 T, 𝜈 1 2 = 600 MHz, and MAS, 𝜈 -of 30 kHz, shows that the OPTIANS polarization transfer