//----------------------------------------------------------
vacuum             1  1.e-16  1.e-16  1.e-16
                   0  1  20.  .001
                   0
carbon             1  12.011  6.0  2.265
                   0  1  20.  .001
                   0
gold               1  196.97  79.  19.3
                   0  1  20.  .001
                   0
lead               1  207.1  82.  11.34
                   0  1  20.  .001
                   0
silicon            1  28.0855 14.0 2.33
                   1  1  20.  .001
                   0
aluminium          1  26.98 13. 2.7
                   0  1  20.  .001
                   0
magAl		   1  26.98 13. 2.7
                   1  1  20.  .001
                   0
beryllium          1  9.01  4.0 1.848
                   0  0  20.  .001
                   0
iron               1  55.847  26.  7.87
                   1  1  20.  .001
                   0
air                3  14.01  16.  39.95  7.  8.  18.  1.205e-3  .755  .231  .014
                   0  1  30.  .001
                   0