[Pw_forum] how to get Interatomic force constants

[张睿智]

Dear all
 
I calculated Pb2MgTeO6, following example06. But I do not know how to get the 
IFC?s. As README in example06 tells, the IFC?s are contained in the 
Pb2MgTeO6.fc file, but in this file there are only ten matrix(see below), 
represents atom1-atom10.  How can I know the IFC between Pb-O, Te-O, Mg-O, from 
these matrix?
 
Thanks in advance!
 
Ruizhi Zhang
 
File  Pb2MgTeO6.fc :
4   10  6  7.4000000  0.0000000  2.0000000  0.0000000  0.0000000  0.0000000
           1  'Pb '    188835.295021681     
           2  'Mg '    22146.2242713651     
           3  'Te '    116290.461606016     
           4  'O  '    14581.3292430979     
    1    1      0.0000000      0.0000000      0.0000000
    2    1      0.0000000      0.0000000      0.5000000
    3    3      0.5000000      0.5000000      0.2500000
    4    2      0.5000000      0.5000000      0.7500000
    5    4      0.0000000      0.5000000      0.2500000
    6    4      0.5000000      0.0000000      0.2500000
    7    4      0.5000000      0.5000000      0.0000000
    8    4      0.0000000      0.5000000      0.7500000
    9    4      0.5000000      0.0000000      0.7500000
   10    4      0.5000000      0.5000000      0.5000000
 T
      4.1933979      0.0000000      0.0000000
      0.0000000      4.1933979      0.0000000
      0.0000000      0.0000000      2.8329171
    1
      2.5435018      0.0000000      0.0000000
      0.0000000      2.5435018      0.0000000
      0.0000000      0.0000000      1.0565631
    2
      4.8855740      0.0000000      0.0000000
      0.0000000      4.8855740      0.0000000
      0.0000000      0.0000000      1.4231015
    3
      7.1430642      0.0000000      0.0000000
      0.0000000      7.1430642      0.0000000
      0.0000000      0.0000000      1.6769868
    4
      2.1843092      0.0000000      0.0000000
      0.0000000      2.1843092      0.0000000
      0.0000000      0.0000000      0.9994853
    5
     -3.1560227      0.0000000      0.0000000
      0.0000000     -2.9150001      0.0000000
      0.0000000      0.0000000     -1.0074367
    6
     -2.9150001      0.0000000      0.0000000
      0.0000000     -3.1560227      0.0000000
      0.0000000      0.0000000     -1.0074367
    7
     -2.6919408      0.0000000      0.0000000
      0.0000000     -2.6919408      0.0000000
      0.0000000      0.0000000     -0.5388230
    8
     -2.3280761      0.0000000      0.0000000
      0.0000000     -3.1469200      0.0000000
      0.0000000      0.0000000     -0.9853135
    9
     -3.1469200      0.0000000      0.0000000
      0.0000000     -2.3280761      0.0000000
      0.0000000      0.0000000     -0.9853135
   10
     -2.5184896      0.0000000      0.0000000
      0.0000000     -2.5184896      0.0000000
      0.0000000      0.0000000     -0.6318133
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