With the card firmly seated in the slot, check the cable is not fouling any part of the PC casing.
Replace and fix the PC cover.
Lift the ventilation grille off from the top of the unit.
As the gravitational waves pass through the L-shaped detectors, they will decrease the distance between the test masses in one arm of the L, - while increasing it in the other.
The measurement is performedby bouncing high-power laser beams back and forth between the test massesin each arm, and then interfering the two arms' beams with each other.
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