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# constraint\_kind
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valid constraints:
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## 1 Particle constraints
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* *fix\_x*: keep x position fixed
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* *fix\_y*: keep y position fixed
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* *fix\_z*: keep z position fixed
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* *fix\_xy*: keep x and y positions fixed
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* *fix\_xz*: keep x and z positions fixed
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* *fix\_yz*: keep y and z positions fixed
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* *fix\_xyz*: keep x, y and z positions (i.e. fix the atom position) fixed
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## 2 Particle constraints
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* *fix_distance*: fixes the distance (bond length)
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## 3 Particle constraints
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* *fix_angle*: fixes the angle of the second atom with the first and third
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## 4 Particle constraints
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* *fix_dihedral*: fixes the dihedral angle between the first three and the last three atoms (out of four)
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