Example of the injection flux estimation method for the case of the sph2 sequence. Each subplot refers to a different angular separation, and shows the S/N of an injection (y axis), retrieved from the PCA post-processed frame with one principal component, as a function of its scale factor (x axis). Each point in cyan on subplots thus represents a fake companion, which has been injected in the ADI sequence at random coordinates within the corresponding annulus and with a random scale factor. The thin red line is the curve fit of all injections, and dashed horizontal curves in black delimit the chosen S/N range, which is from one to three in this case. The two red dots show the intersection between the curve fit and the S/N limits (step 6), which therefore define the range of the scale factor corresponding to the chosen S/N limits.