s=8, p=6; symmetric 7-fold Strang composition recombined, analogous to Y 8-6 (Chambers 2003)
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see also Blanes/Casas/Chartier/Murua (2013)
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composition weights (optimal choice):
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ω1 = 0.186532492812133818 + 0.00310743071007267520 i
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ω2 = 0.129559101282088263 - 0.123989612188092593 i
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ω3 = 0.116900037554661284 + 0.0434282546160603418 i
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and ω0 = 1 - 2(ω1+ω2+ω3)
= 0.134016736702233270 + 0.154907853723919152 i
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LEM: 0.04
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