Radial contrast limits as a function of separation for the deepest ZIMPOL high-contrast dataset of τ Ceti in the R_PRIM filter. The plot shows the 5σ limits for the intensity and polarised intensity from the same observation as well as the 1σ photon noiselimit for the polarised intensity. The meaning of the colours and symbols is the same as in Fig. 6, except that we only subtracted 10 PCs during the PCA-ADI step for the polarised intensity. For this dataset the resulting contrast limits were significantly better with only 10 instead of the 20 PCs that we used for all other datasets.
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