Fig. 6.

a Simulated dependence of R _1ρ on the step size for an AFP pulse with ω ^max₁ = 1 kHz, ν _sweep = 1 kHz, t _AFP = 100 ms, 20% ramp (sin² θ _eff = 0.83). We simulated the rate as a function of k _ex, with p _B = 4%, and Δω/2π = 240 Hz. As a reference, the results for a step size of 0.02 ms (number of steps: 5,000) are given (black line). The required number of steps to obtain accurate results with the given parameters is about 500 steps (blue line). b Numerical simulation with (grey) and without (black) BCH approximation. (p _B = 4%, Δω = 240 Hz, ω ^max₁ = 1 kHz, ν _sweep = 1 kHz, t _AFP = 100 ms and 20% ramp, sin² θ _eff = 0.83)