-Axial Actuators (under mirror): 120

-Lateral Actuators (at edge of mirror): 60

-Actuators: Axial support has both passive hydraulic and pneumatic active optics

elements; lateral is passive hydraulic

-Primary Air Pressure System: supports up to 80% of the mirror's weight (at Zenith)

with pneumatic servo-valves

-Mass/Weight of Primary Mirror Cell: 80 Metric Tonnes/88 US Tons

-Precision and Range of Actuator Movement: Limited to position sensor –

Approximately +/- 1 micron resolution. Range +/- 2mm in X,Y & Z axes

-Rate of Adjustment of Forces: Approximately once per second from look-up tables,

feedback from wavefront sensors every minute.

-Processing Power Necessary:1,600 MIPS (Million Instructions Per Second)