Representation of all non-operational shutters as measured at the end of the final cryo-vacuum ground test in 2017 (Rawle et al. 2018): Failed closed (dark green colour), vignetted shutters (light green colour, and transparent to show failed shutters behind the field stop), and lines and rows of shutters removed from service by the short masks (olive green colour). Failed open shutters are highlighted by red circles. Quadrant orientation is the same as in Fig. 1.