before_revision:  A Bouguer reduction is called simple or incomplete if the terrain is approximated by an infinite flat plate called the Bouguer plate. A refined or complete Bouguer reduction removes the effects of terrain  precisely. The difference between the two , the differential gravitational effect of the unevenness of the terrain , is called the terrain effect. It is always negative.
after_revision: Reduction A Bouguer reduction is called simple (or incomplete) if the terrain is approximated by an infinite flat plate called the Bouguer plate. A refined (or complete) Bouguer reduction removes the effects of terrain more precisely. The difference between the two is called the terrain effect and is due to the differential gravitational effect of the unevenness of the terrain ; it is always negative.
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