Here’s how the NFL draws the ‘magic yellow line’ in televised games

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While watching an NFL football game on TV, you probably noticed the “magic yellow line” that appears on the field that helps viewers track what is happening in the game.

It’s an impressive technical feat that relies on several different systems working together, adding less than one second of a delay to the live broadcast.

Watch this video by Vox to see how it’s done.

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