These numbers represent the area that a trooper unit could target if you plopped them down in the middle of open terrain. I technically did not account for the thickness of unit leader base, so the numbers are marginally lower than on the actual table.
So, good old Pie R^2 with the ranges as the radius gives us these numbers:
6" (range 1) = 113.1" sq
+ 339.29" sq gets to
12" (range 2) = 452.39" sq
+ 565.49" sq get to
18" (range 3) = 1017.88" sq
+ 791.68" sq gets to
24" (range 4) = 1809.56" sq
For fixed guns, I believe just divide all of these numbers by 4 (because the firing arcs are 90 degrees).
Not sure how useful these are, but pretty much the difference between range 3 and 4 is larger than the difference between 2 and 3, etc. So maybe those fleet troopers won't struggle that much...
Or maybe they will. 565.46" sq is the difference between range 2 and 3, but that difference is actually larger than the entire area range 2 covers (only 452.39" sq). Having an 18" radius (range 1 to 3 weapon) leads to an area more than twice as large as having a 12" radius (range 1 to 2 weapon), even though the radii are only 6" different.
Edited by HanScottFirst