Left: read noise performance. The low-gain mode histogram plot is in blue and the high-gain histogram plot is in red. The requirements for the two modes is shown in the vertical dashed lines of the corresponding colours. The median value of the high-gain noise is 5.8 electrons and the low gain is 35.1 electrons. Right: linearity response in high gain. The linearity was computed within 16 regions. Each region is plotted as the total signal (left axis) vs. the exposure time and the difference from a linear fit expressed as a ratio to the total signal (right axis). The horizontal dashed lines give the lower and upper limits of the ratio requirements.