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[zfhou@mail.edu.cn]

Dear abinit users,

I have tested to calculate the strain pertubations of strain type for 
Silicon(diamond structure) and got the output file. Now I have some question 
about the rigid-atom elastic tensor.
1. What is the unit of rigid-atom elastic tensor?
2. How to map the the following data to the C11, C12, C44 of cubic Silicon?
I know the elastic tensor of cubic crystal can be written the following 6x6 
matrix:
    {C11  C12  C12               }
    {C12  C11  C12               }
C=  {C12  C12  C11               }
    {               C44          }
    {                   C44      }
    {                        C44 }

Thanks for your kind help!
Regards
zhufeng

--------My calculated output file:----------------------------
 Rigid-atom elastic tensor , in cartesian coordinates,
     j1       j2             matrix element
  dir pert dir pert     real part    imaginary part
  
   1    5   1    5    0.0082516915    0.0000000000
   1    5   2    5    0.0048080107    0.0000000000
   1    5   3    5    0.0048080107    0.0000000000
   1    5   1    6    0.0000000000    0.0000000000
   1    5   2    6    0.0000000000    0.0000000000
   1    5   3    6    0.0000000000    0.0000000000
  
   2    5   1    5    0.0048080097    0.0000000000
   2    5   2    5    0.0082516959    0.0000000000
   2    5   3    5    0.0048080107    0.0000000000
   2    5   1    6    0.0000000000    0.0000000000
   2    5   2    6    0.0000000000    0.0000000000
   2    5   3    6    0.0000000000    0.0000000000
  
   3    5   1    5    0.0048080097    0.0000000000
   3    5   2    5    0.0048080107    0.0000000000
   3    5   3    5    0.0082516958    0.0000000000
   3    5   1    6    0.0000000000    0.0000000000
   3    5   2    6    0.0000000000    0.0000000000
   3    5   3    6    0.0000000000    0.0000000000
  
   1    6   1    5    0.0000000000    0.0000000000
   1    6   2    5    0.0000000000    0.0000000000
   1    6   3    5    0.0000000000    0.0000000000
   1    6   1    6    0.0062890190    0.0000000000
   1    6   2    6    0.0000000000    0.0000000000
   1    6   3    6    0.0000000000    0.0000000000

   2    6   1    5    0.0000000000    0.0000000000
   2    6   2    5    0.0000000000    0.0000000000
   2    6   3    5    0.0000000000    0.0000000000
   2    6   1    6    0.0000000000    0.0000000000
   2    6   2    6    0.0062890126    0.0000000000
   2    6   3    6    0.0000000000    0.0000000000
  
   3    6   1    5    0.0000000000    0.0000000000
   3    6   2    5    0.0000000000    0.0000000000
   3    6   3    5    0.0000000000    0.0000000000
   3    6   1    6    0.0000000000    0.0000000000
   3    6   2    6    0.0000000000    0.0000000000
   3    6   3    6    0.0062890119    0.0000000000
-------------------------------------------------------