A: dot invis B: dot invis at 4cm south of A C: dot invis at 3cm east of B D: dot invis at 3cm east of A E: dot invis at 1/2<A, C> E1: dot invis at 1/2<A, B> E2: dot invis at 1/2<C, D>
F: dot invis at 0.5cm south of E G: dot invis at 1cm south of E H: dot invis at 1cm north of E G1: dot invis at 1/2<E1, B> G2: dot invis at 1/2<E2, C> H1: dot invis at 1/2<A, E1> H2: dot invis at 1/2<D, E2> S1: spline from A to H1 then to F then to G1 then to B S2: spline from D to H2 then to F then to G2 then to C line from A to D line from B to C define split_line { $2: line dotted from 3.5cm west of $1 to 1.5cm east of $1 }
"layer 1" ljust at 0.5cm south of SG.w "layer 2" ljust "spanning layer" ljust color red at 0.5cm south of SE.w "layer 3" ljust at 0.5cm south of SH.w "layer 4" ljust at 0.5cm north of SH.w