Setting up Autobed leveling in Marlin

[gatonini]

Hi

I'm trying to figure out how the numbers work in marlin for setting up a rectangle so my probe can take readings my numbers now are 15 170 180 20 I cant figure out how this works do i want to make the numbers larger or smaller to increase the movement of my probe ? It first comes out to the left front corner then moves to the right then the table moves out towards me and it takes a reading in rear right then moves the probe left to the left rear corner. So for example If I want the front left corner to read closer to the edge of the glass what number do I change and will the number be larger or smaller totally lost thanks for your help.

Gary