butterfly harmonic pattern:
X=5.48e-9
A=3.27e-10
AB=0.78 XA
BC=0.88 AB
0.61 BC=1.42e-9
0.61 XA=1.86e-9
0.78 BC=1.97e-9
0.88 BC=2.4e-9
0.78 XA=3e-9
0.88 XA=3.97e-9
1.13 XA=7.9e-9
1.6 BC=1e-8
1.27 XA=1.18e-8
1.41 XA=1.74e-8
2 BC=2.13e-8
1.6 XA=3.13e-8
2.24 BC=3.41e-8