pair coefficient for cu-water

hi dear
there is a cubic which contains cu-water .to simulate it there is a problem in quantity of pair coeff for lj/cut.i mean 2.8 or .583 or 3.157.(in first line :pair_style hybrid lj/cut/coul/long 0.1521 3.157 eam lj/cut .583 #2.8 # 3.157 # 7.5) which one is true.can any one give me charts or article which shows the correct quanty.
thanks for any help

pair_style hybrid lj/cut/coul/long 0.1521 3.157 eam lj/cut .583 #2.8 # 3.157 # 7.5
pair_coeff 1 1 lj/cut/coul/long 0.0460 0.4000 #H-H epsilon sigm # 108.0e-21 32.0e-11
pair_coeff 1 2 lj/cut/coul/long 0.0836 1.7753 #O-H epsilon sigma
pair_coeff 1 3 lj/cut 0.6589 0.2117 #H-Cu epsilon sigma
pair_coeff 2 2 lj/cut/coul/long 0.1521 3.157 #O-O epsilon sigma # 0 0
pair_coeff 2 3 lj/cut 1.198 1.587 #O-Cu epsilon sigma
pair_coeff 3 3 eam cu.eam #Cu-Cu

No one can give you any advice on your model. You should look for those parameters in the published articles.