Stability of the UVB (top), VIS (center) and NIR (bottom) spectrographs over 6 consecutive nights as measured during the third commissioning run. The dark and light green points show the FWHM in X and Y of a 0.5′′ pinhole, the black and blue points show the X and Y position of a reference calibration line with respect to its position measured at zenith on the first day and the red points show the ambient temperature (for UVB and VIS only since it is irrelevant for the temperature controlled NIR arm).