Performance comparison for Hα imaging with SPHERE/ZIMPOL using different filters (narrow and broad Hα) and reduction techniques (ADI and ASDI) based on the HD142527 dataset. In all panels the FPF obtained for HD142527 B is shown, as a function of the number of subtracted PCs used in PynPoint. On the right side of each panel we give the scale of the S/N to improve understanding of the plot and to compare different instrumental setups. We note again that this does not correspond to the classical σ notation. The gray regions indicates a confidence level for the detection of HD142527 B of at least 99.99995%, i.e., >5σ in case of Gaussian noise. Because of the applied corrections for small sample statistics, the border of the gray area does not correspond to an S/N of 5.