Analysis of persistence contamination on the WFC3 IR HUDF exposures. In colour bins and white labelled contours, we represent the fraction of exposures that present a certain level of surface brightness contamination by persistence or higher (vertical axis) as a function of the fraction of the total amount of pixels that are affected (horizontal axis), for the F105W (top left), F125W (top right), F140W (bottom left) and F160W (bottom right) bands.