Examples of real CFIS test stars, the estimations of both methods, and the pixel residuals. The exposures are the same as in Fig. 9. We present four test stars with the estimated PSF models and the corresponding residuals. Top-left star: a star extracted from the top-left corner of the focal plane with a S/N of 19. Top-right star: a star leading to a high error for both methods. Bottom-left star: a star located in the centre of the focal, with a relatively high S/N of 160. Bottom-right star: a star located in the bottom-right corner of the focal plane, with a low S/N of 4.