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Fig. 1

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Every time that the distance between the Earth and any of the asteroids of the sample is smaller than 100 Earth radii (100 R), we considered that there was an encounter at time te. We integrate 5 days in the past to obtain the initial conditions of the encounter. In this figure, d is the impact parameter, V the relative velocity of the encounter, q the minimum distance of the encounter, and Vq the relative velocity at this point.

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