Typical spectral extractions for injected planets located at separations of 600 mas. These spectra are representative of the HR 8799 planets with (F_p/F, ~ 2 × 10⁻⁶). The injections into the SPHERE data are shown on the top panel, the GPI on the bottom. Each injected planet was positioned 150° from HR 8799 e. Extractions for each algorithm are plotted, with the best fit spectrum (χ²) and 1σ error bars from the diagonal of the covariance matrix highlighted by the shaded region. The faint lines show the variation in the extractions using different numbers of principal components.