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angle_style harmonic
angle_coeff 1 0.6613 109.47
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Angles section:
• one line per angle
• line syntax: ID type atom1 atom2 atom3
ID = number of angle (1-Nangles)
type = angle type (1-Nangletype)
atom1,atom2,atom3 = IDs of 1st,2nd,3rd atoms in angle
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