A TdRank3Tensor is a third rank tensor
with Td point group symmetry. The argument d14
is a real number. The first integer in the argument name is a
space index (1, 2, or 3) and the second is a Voigt index (1
Figure 6.146. Structure of a Td Third Rank Tensor
Structure of a Td rank 3 tensor. For an explanation of
the symbols, see Figure 6.57.