PSF fitting. Each panel refers to a different PSF (as labelled in lower panels). This is J band, "Main" annulus (usually identified with #7). The P0/P1 ratio is also given in the figure. Upper panels: gray is SBF residual frame power spectrum (E(k)), red is the PSF power spectrum fit. Lower panels: gray is the P0 value obtained by fitting the E(k) using a PSF P(k-fit) where k-fit is larger than k. The range of P0 used for the final mean P0 is derived in the region between vertical dotted lines. The fit with PSF j1 looks much worse than with other PSFs. The star is probably saturated, hence it is not used for the final averaged P0