NEGATIVE GAIN

of or characteristic of processing which deals with eradication of the past (taking away engrams and making things disappear that have been annoying or unwanted), as opposed to positive gain which deals with the present and future. —The Anatomy of the Human Mind Glossary

of or characteristic of processing which deals with eradication of the past (taking away engrams and making things disappear that have been annoying or unwanted), as opposed to positive gain which deals with the present and future.

you can erase engrams, that's taking away. You get actually negative gain. By the removal of the harmful thing you can get a positive advance. That's called negative gain. (ESTO 6, 7203C03 SO II)