IN VACUUM beam heights are ALL 5.5" This is measured from the top of the optical table to the center of all TMs, mirrors and other optical components. This beam is ~36" above the floor.
PSL (inside of enclosure) main-output beam: PMC, MZ, RC and ISS are at 3" heights. IOO Angle & Position, MC-Trans and RFAM qpds are at 4"
ALL OTHER beam heights at atmosphere and different ISCT (interferrometer sensing, control optical table)s are at 4"
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