Measurements (dots) and models (lines) for the wavefront transfer function for the infrared (top) and visible WFS (bottom), configured at the maximum frame rate of 1000 Hz. The model is fitted to the data by adjusting the integral gain K_i and the pure-delay T_d. The rejection bandwidth defined at −3 dB is also given. Data are presented for GPAO2 but similar results are obtained on the other systems.