How Asia and London ranges shape the New York session.

Asia runs from 20:00 to 02:00, London from 02:00 to 08:00 and New York from 08:00 to 16:00. London Engulfs Asia means London exceeds both Asia extremes. Asia Engulfs London is the reverse. A partial engulf exceeds one Asia extreme while the other London extreme stays inside Asia. Over its eight-hour window, New York has enough time to trade through at least one boundary of each six-hour overnight range, so the combined break rate is near certain. The pattern rows show the useful differences between overnight structures.