What is the format of the current FIDE World Rapid Championship?

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TheSnowFortDefense

I know it is Swiss, but what type of Swiss? If you look at round 1 which is still going on, pairings seem to be based on ~250 points.

Carlsen 2818 vs. Petrov 2509
Niemann 2606 vs. Gaehwiler 2384

At first, I thought McMahon. Or, is it another?

https://en.wikipedia.org/wiki/Swiss-system_tournament