#Elastic constants of PbTe (GPa) from Cochran, et al Proc. Roy. Soc. 1966
107.4 7.8 7.8 0 0 0
7.8 107.4 7.8 0 0 0
7.8 7.8 107.4 0 0 0
0 0 0 12.9 0 0
0 0 0 0 12.9 0
0 0 0 0 0 12.9
