1. Abridged to only those lines which are still POSSIBLE (2007)
These 2 (or 4) lines would enable to distinguish
in a quantative way between
rotation of the bridge
bending of the bridge
deformation or C-Frames
High precision in Y and Z (~ 5 microns) because there is lots of space for lenses with large diameter
Possible :
cable trays in place, easy access,
6 spare channels in RasMux, 7 spare holes in patch pannels, spare cables, standard masks, spare CCDs

2. Points used by RASNIK short lines
Upper 6 points need RASNIK alignment (x,y,z)
points mark positions
of CCD with lenses
fixed together to
rails or pillars
(not to C-frames)
6 lower points
insignificant movements – no RASNIK

3. 2 (or 4) lines on top of the bridge
MASK
LENS
CCD
(out of scale)

4. Horizontal lines above upper rails (on top of the bridge)
2 (or 4) lines above rails
2 CCD, 2 masks, 2 (or 4) lenses z x
~ 8 cm LENES
10cm up
10.5°
MASK
CCD
1407
10cm up
MASK
CCD
7600