I've been immersed in wwi aviation for fifty years and think I know the subject pretty comprehensively but figures 6 & 7, displayed above with the fuel tank in red, really rocked me back on my heels.
Imagine sending teenagers to war, facing incendiary bullets, seated directly behind a fragile tank of l'essence.
I suppose I'm influenced by a recent visit to East Fortune, climbing around their Me163 and staring at the T-Stoff and C-Stoff tanks, which could rupture and dissolve the pilot, but the red colouring above really hit me how crazy the relationship between pilot and fuel was in the Great War. (I appreciate the positioning of the fuel mass would greatly affect the aeroplane's ability to manoeuvre.)
Somehow, sitting ON the tank, where (hopefully unignited) fuel could pour out below and away from you, seems slightly safer than sitting right behind it where you are going to get covered no matter what!