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# PCDAT

The PCDAT file contains the pair correlation function. For dynamic simulations (IBRION${\displaystyle \geq }$0) an averaged pair correlation is written to the file (see also NBLOCK, KBLOCK, NPACO and APACO).

A sample output of the PCDAT file for a 64 atom cell of Si looks as follows:

   1  64   1   0  0.2002283E+02  0.2000000E+04
CAR
unknown system
0   0   0
1   50
256 256 256
256
0.1000000E-09
0.6250000E-11
1
0.3000000E-14  0.1086180E-08  0.1086180E-08  0.1086180E-08
0.1998973E+04  0.2065831E+04
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
...
0.1998973E+04  0.2065831E+04
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
...


Here is the description of each line:

• Line 1: 1 (fixed output), number of ions, 1 (fixed output), 0 (fixed output), unit cell volume divided by number of atoms, temperature.
• Line 2: CAR (fixed output).
• Line 3: Header of INCAR file (the tag SYSTEM).
• Line 4: 0, 0, 0 (all fixed output).
• Line 5: 1 (fixed output), KBLOCK${\displaystyle \times }$NBLOCK.
• Line 6: NPACO, NPACO, NPACO.
• Line 7: NPACO.
• Line 8: 10-10 (fixed output).
• Line 9: APACO${\displaystyle \times }$10-10/NPACO.
• Line 10: NSW/NBLOCK/KBLOCK.
• Line 11: POTIM${\displaystyle \times }$10-15, norm of lattice vector 1 times 10-10, norm of lattice vector 2 times 10-10, norm of lattice vector 3 times 10-10.
• Line 12-(12+NPACO): Input mean temperature/(NBLOCK${\displaystyle \times }$KBLOCK), actual mean temperature. Following that the next NPACO show the pair correlation function.
• Optional (KBLOCK${\displaystyle \times }$NBLOCK/NSW)${\displaystyle \times }$NPACO+1 lines: The above is repeated KBLOCK${\displaystyle \times }$NBLOCK/NSW times.