At flight levels of 290 and above the vertical separation between aircrafts on opposite tracks is increased from 1000 to 2000 feet.
Reduced vertical separation minimums- is a procedure of reducing the vertical separation of 2000 feet to 1000 feet within the flight level of fl 290 to fl410. This can be done only if the aircrafts flying in the rvsm zone have certain specified instruments and equipments on board.