(a) estimated wavefront of the nominal SCExAO system using the internal source and reconstructed by combining the estimated modal coefficients of the 30 Zernike modes. The estimated WFE is ∼100 nm rms. (b) introduced and (c) estimated wavefront from closed-loop tests with the internal source. The introduced wavefront (b), consisting of 50 Zernike modes, has a rms WFE of ∼293 nm. The estimated wavefront (c), using the same 50 Zernike modes, with an rms WFE of ∼311 nm. The estimated wavefront also includes other WFE already present in the system.