Sources told PTI that the vertical separation between the two aircraft was only about 200 feet and a mid-air collision was averted after the Traffic Collision Avoidance System (TCAS) alarms went off.
from Times of India https://timesofindia.indiatimes.com/india/two-indigo-planes-avert-mid-air-collision-over-bengaluru-airspace/articleshow/64958526.cms
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