Dear all,

In XYZ file,  for instance,  Nanotube(3.3)     It is like:

 12   *How many atoms in the system*
                  2.45778    *Lattice constant*              1.41900  *what
this one stands for?*
    C   2.03256769511475710033   0.00000000000000000000
0.00000000000000000000
    C   1.55703715080933680071   1.30650937471709660542
-0.00000000000000005254
    C   1.01628384755737877221   1.76025525888096323612
1.22889004797011835990
    C  -0.35295173338285917852   2.00168841459557622642
1.22889004797011835990
    C  -1.01628384755737810607   1.76025525888096345817
0.00000010049879950458
    C  -1.90998888419219636781   0.69517903987847973202
0.00000010049879945204
    C  -2.03256769511475710033   0.00000000000000024891
1.22889014846891786448
    C  -1.55703715080933746684  -1.30650937471709593929
1.22889014846891786448
    C  -1.01628384755737943834  -1.76025525888096279203
0.00000020099759900916
    C   0.35295173338285806830  -2.00168841459557622642
0.00000020099759895662
    C   1.01628384755737721790  -1.76025525888096412430
1.22889024896771736906
    C   1.90998888419219636781  -0.69517903987847995406
1.22889024896771736906

When we write XYZ file for CH4:


 5 *Atom number in systems*

                 * how to write down the other two parameters?
*
* *

* *C  0.000      0.000      0.000  * *
 H  1.219     -0.284     -0.377
 H -0.284      1.219     -0.377
 H -0.140     -0.140      1.219
 H -0.833     -0.833     -0.503




Any hints would be much much appreciated!


Lily

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