(1) Sc1 clearly proximad of the level of R2+3 (vs. Sc1 slightly proximad of the level of R2+3); (2) Sc2 slightly distad of R forking (vs. Sc2 at the position of R forking); (3) R2+3 at the same level of M1+2 forking (vs. R2+3 proximad of M1+2 forking); (4) bM1+2 significantly longer than dM1+2 in length (vs. equal to dM1+2 in length).