When the TERR On ND button is pressed on the Airbus A320 Cockpit, the TERR information apears on the ND, and 2 boxes in yellow appear.

A320 "TERR ON ND" button

A320 ND showing terrain with green numbers in yellow boxes

What do the numbers 146 and 073 mean respectively?

14600 ft and 7300 ft.

A320 FCOM DSC-31-45 :

Minimum and maximum elevations encountered ahead of the aircraft, within the selected ND range.

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