Examples of different PW probes introduced on DM1 (top) and their corresponding LOWFC loop responses on DM1 (bottom) obtained by projecting the command on the controlled basis of the LOWFC loop and using the control matrix to estimate the feedback command. From left to right: two examples of single-actuator probes poked by 10 nm in wavefront error; two of the 4 HiCAT probes designed to specifically modulate the electric field in the DH. To match the top and bottom row color bars, the bottom commands have been scaled by a factor of 100. The commands shown here are over the whole controllable area of the DM1. The hexagons represent the projection of the segmented aperture onto DM1.