What are Zone 20, Zone 21 and Zone 22?

Name: SynergenOG
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Zone 20, Zone 21 and Zone 22 are dust zones. Zone 20 is continuous or frequent dust cloud presence, Zone 21 is likely occasional dust cloud presence during normal operation, and Zone 22 is unlikely or short-duration dust cloud presence.

What are Zone 20, Zone 21 and Zone 22?

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