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Book 2: fix typo
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hollasch committed Apr 20, 2024
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![Figure [ray-slab-interval]: Ray-slab $t$-interval overlap
](../images/fig-2.04-ray-slab-interval.jpg)

In this figure, the upper ray intervals to not overlap, so we know the ray does _not_ hit the 2D box
In this figure, the upper ray intervals do not overlap, so we know the ray does _not_ hit the 2D box
bounded by the green and blue planes. The lower ray intervals _do_ overlap, so we know the lower ray
_does_ hit the bounded box.

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