TII subcells for the Sp(6,R) x SO(7) block of Sp6
#
cell#0 , |C| = 1
special orbit = [6]
special rep = [[3], []] , dim = 1
cell rep = phi[[3],[]]
TII depth = 1
TII multiplicity polynomial = X
TII subcells:
  tii[6,1] := {0}