TI Derived by GJA 28/8/89 Smooth functions, Elastic constants to within 9%
   -57.099097   80.735598  -21.761468  -10.396479   74.515028   35.921024
     1.220000    1.200000    1.120000    0.950000    0.800000    0.707107
    39.795927  -40.061305
     1.220000    1.050000
     4.173061    4.173061

Zirconium Potential (note typo from Phil Mag in A1 and a2)
  -58.486071  83.692945  -20.958026  -1.309533  65.7263560  139.411255
   1.22       1.2         1.14        0.95      0.8         0.7
   48.288836  -0.852556
   1.22        1.05
   4.570738