What does the green outline of the "preferred position" markers mean?

What does the green outline of the "preferred position" markers mean? - Enjoy Life Text On Green Tiles With Black Background

Trying to decide which hero to put in which spot, I noticed that some heroes have a green outline around several of the "preferred position" markers.

What does that green outline mean? Does it have something to do with ranged attacks?

The position markers to the left show a green outline

The picture is from the status screen of an Arbalest.






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