The ground scale in LOS is warped in that 1"=2m but given the size of the figs, 1.5" should be about 2m. The tiers match the height of the figs, not the ground scale, but they try to make it all match up. For simplicity sake, pretend the ground and height scale match, and the trigonomitry can be approximated the same way we do with the diagonal rule. When looking at X(range) Y(diagonals) and Z (tiers) count the latter as 2" each then add the largest, plus have the next plus a quarter of the smallest. So 4" range plus 4 diagonals plus two tiers for another 4" would be 4+2+1=7" Actual calculation= 6.93"