I have installed gromacs version 4.5.3. when I want to use pdb2gmx for generating .top and .gro files for 1000 argon atoms, in topology file I have seen another atom O with mass 1.48594e-41 as below I do not know what to do.I do not confront with such problems when I had 4.0.7 version of gromacs. please help me. also I have used gromos43a1 force feild. [ moleculetype ] ; Name nrexcl Other_chain_A 3
[ atoms ] ; nr type resnr residue atom cgnr charge mass typeB chargeB massB ; residue 1 GAS rtp GAS q 0.0 1 AR 1 GAS AR 1 0 1 ; qtot 0 ; residue 2 GAS rtp GAS q 0.0 2 O 2 GAS AR 2 0 1.48594e-41 ; qtot 0 ; residue 3 GAS rtp GAS q 0.0 3 O 3 GAS AR 3 0 1.48594e-41 ; qtot 0 ; residue 4 GAS rtp GAS q 0.0 4 O 4 GAS AR 4 0 1.48594e-41 ; qtot 0 ; residue 5 GAS rtp GAS q 0.0 5 O 5 GAS AR 5 0 1.48594e-41 ; qtot 0 ; residue 6 GAS rtp GAS q 0.0 6 O 6 GAS AR 6 0 1.48594e-41 ; qtot 0 ; residue 7 GAS rtp GAS q 0.0
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