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This mod is based on GreyHak's DSP Show Grid.
This mod gives you an option to customize the lower bound and upper bound of the displaying altitude of the grid when you entering the build mode and moving your cursor around on the surface of a planet.

Check to enable the customized altitude range, click the cog icon to open the config window, uncheck to restore to default settings.
Settings will be saved when you exit the game.
Build target: game version 0.9.25.12201, BepInEx version: 5.4.19 (should work under 5.4.17)
Initial version