27  Electronically signed on 14/08/2018 18:31 (UTC+02) in accordance with article 4.2 (Validity of electronic documents) of Commission Decision 2004/563 e. The vertical opening of the collimator shall be reduced to 3.0 mm on the detector  side and 20 mm on the side closest to the fuel.  f. The overall dimensions shall be reduced, maintaining a 20mm wall thickness around  the electronic components.  g. The method for securing the back-end boards within the collimator housing shall be  simplified.  After the collimator has been redesigned, it could be possible to reduce the size of the  rotating platform and thus reduce the overall width of the torus. The overall envelope  of the PGET can be reduced accordingly.  f) Additional design updates(optional): 