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[Music]

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at 90 meters this is the distance between

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each pair of lasers to measure in a

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single pass of the satellite the slope

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located in the path of the laser

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atlas uses three pairs of aces separated from each

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other by 90 meters distance and

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with a track of  reference each other

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on subsequent passes even if the

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two aces are slightly higher or

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lower than where they were the first time

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scientists can still calculate the