Upgraded support shielding question

Hello, on the terminal website the documentation says that when a support is upgraded, the shielding increases to “Range increased to 7 units. Base shielding increased to 4. Grants (0.3 * Y position) additional shielding.” I don’t understand what the 0.3 * Y position additional shielding refers to. Does it refer to the Y position of the support or the Y position of the attack units as they move to the opposing side? Any help would be appreciated.

It refers to Y of the support. Use the playground to try out things like this and see what happens!