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If your question is asking why does the green line show up sometimes during a race, then the following answer will apply. The green line is the pace at which the current world record was swum. Not totally clear on your question, but the green line refers to the current world record. So for example, when you see U.S. swimmer Michael Phelps fly past that CGI green line, you know he has just broke another world record time.

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16y ago

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