# Number of Species
1
Si

# Si-Si-Si-Si interaction1
7.041365010799137
0.60107948999545
4
0
1.80
1.727861771058315
20.302375809935207
1.145530046298506
2.0951
2.315
5.0
-0.3333333333333333

# Above values correspond to the following parameters line by line
#   Line 1: Any comments
#   Line 2: nSpecies, where nSpecies is the number of species and can be either 1 or 2
#   Line 3: chemical symbols of the species (separated by a space if nSpecies=2)
#   Line 4: Any comments, e.g. parameters for nInteractions below starting with 1st, or blank space. More blank lines may follow.
#   Line 5: A
#   Line 6: B
#   Line 7: p
#   Line 8: q
#   Line 9: a
#   Line 10: lambda
#   Line 11: lambda_2
#   Line 12: gamma
#   Line 13: sigma in Angstrom
#   Line 14: epsilon in ev
#   Line 15: Q
#   Line 16: costheta_0

# If nSpecies = 1, then ignore additional lines. Otherwise
# continue listing the parameters for 2nd interaction
#   Line 19: A
#   Line 20: B
#   Line 21: p
#   Line 22: q
#   Line 23: a
#   Line 24: lambda
#   Line 25: lambda_2
#   Line 26: gamma
#   Line 27: sigma in Angstrom
#   Line 28: epsilon in ev
#   Line 29: Q
#   Line 30: costheta_0

# If nSpecies = 2, then continue listing the parameters for all
# interactions from 3rd to 16th.

# Note that the overall order in which parameters are given in
# the event that nSpecies = 2 must be as follows, where "A"
# represents the first species given on line 3 and "B" represents
# the second species given on line 3:

# A - A - A - A
# A - A - A - B
# A - A - B - A
# A - A - B - B
# A - B - A - A
# A - B - A - B
# A - B - B - A
# A - B - B - B
# B - A - A - A
# B - A - A - B
# B - A - B - A
# B - A - B - B
# B - B - A - A
# B - B - A - B
# B - B - B - A
# B - B - B - B

#Any additional lines will be silently ignored.

#References:
1. Mistriotis et al, Physical Review B 39, 1212 (1989)
2. Ellad B. Tadmor and Ronald E. Miller, Modeling Materials:
   Continuum, Atomistic and Multiscale Techniques, Cambridge University Press, 2011
3. All parameters in Ref 1 are adjusted for epsilon = 2.315 eV.
#