Sinot
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If the scouts' vision range is rounded down instead of up, then the bonus will be +1/+2/+3/+4, resulting in a 7/14/20/27 range. Simply rounding up gives a +1 bonus from the first level, and +2 from level 7. But even a +3 bonus in the center from the Dungeon is already very good.
If the vision range is rounded down, then at level 24, it will be 16 cells. (from the specialty +6)