Display parameters related to Altitude in Mission Planner

Kindly explain these parameters.

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high chance related to terrain following.
Terrain following (in Auto, guided, etc)

ter_curalt : Actual altitude above terrain
ter_alt : terrain altitude (AMSL)
ter_load : Loaded terrain tiles
ter_pend: Pending terrain tiles (to load)
ter_space : Terrain grid spacing (in meters)

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