Update comment
Clarify the comment as to why this else branch was added and what this represents.
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@ -425,11 +425,11 @@ void FixNEB::min_post_force(int vflag)
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tangent[i][0] = vmax*delxn + vmin*delxp;
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tangent[i][1] = vmax*delyn + vmin*delyp;
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tangent[i][2] = vmax*delzn + vmin*delzp;
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} else if(vnext < vprev) {
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} else if (vnext < vprev) {
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tangent[i][0] = vmin*delxn + vmax*delxp;
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tangent[i][1] = vmin*delyn + vmax*delyp;
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tangent[i][2] = vmin*delzn + vmax*delzp;
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} else { //AGNI "old-tangent" method
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} else { // vnext == vprev, e.g. for potentials that do not compute an energy
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tangent[i][0] = delxn + delxp;
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tangent[i][1] = delyn + delyp;
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tangent[i][2] = delzn + delzp;
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