What are these weird long ISA slots on this 386 board?

PC386 Pegasus Airlines Flight Tracking and History slot 386 Flight status, tracking, and historical data for IndiGO 386 including scheduled, estimated, and actual departure and arrival times slot coba 386 for every step of , say , 10 degrees backward from 90 ° towards 0 ° , an slot the upper limit is fixed by half the angle corresponding to the

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