fix spelling errors
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@ -7231,7 +7231,7 @@ keyword to allow for additional bonds to be formed
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*Replacing a fix, but new style != old style*
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A fix ID can be used a second time, but only if the style matches the
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previous fix. In this case it is assumed you with to reset a fix's
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previous fix. In this case it is assumed you want to reset a fix's
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parameters. This error may mean you are mistakenly re-using a fix ID
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when you do not intend to.
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@ -702,9 +702,10 @@ also accounted for by this fix.
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----------
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If your simulation is a hybrid model with a mixture of rigid bodies
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and non-rigid particles (e.g. solvent) there are several ways these
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rigid fixes can be used in tandem with :doc:`fix nve <fix_nve>`, :doc:`fix nvt <fix_nh>`, :doc:`fix npt <fix_nh>`, and :doc:`fix nph <fix_nh>`.
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If your simulation is a hybrid model with a mixture of rigid bodies and
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non-rigid particles (e.g. solvent) there are several ways these rigid
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fixes can be used in tandem with :doc:`fix nve <fix_nve>`, :doc:`fix nvt
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<fix_nh>`, :doc:`fix npt <fix_nh>`, and :doc:`fix nph <fix_nh>`.
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If you wish to perform NVE dynamics (no thermostatting or
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barostatting), use one of 4 NVE rigid styles to integrate the rigid
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@ -713,13 +714,17 @@ particles.
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If you wish to perform NVT dynamics (thermostatting, but no
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barostatting), you can use one of the 2 NVT rigid styles for the rigid
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bodies, and any thermostatting fix for the non-rigid particles (:doc:`fix nvt <fix_nh>`, :doc:`fix langevin <fix_langevin>`, :doc:`fix temp/berendsen <fix_temp_berendsen>`). You can also use one of the
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4 NVE rigid styles for the rigid bodies and thermostat them using :doc:`fix langevin <fix_langevin>` on the group that contains all the
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particles in the rigid bodies. The net force added by :doc:`fix langevin <fix_langevin>` to each rigid body effectively thermostats
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its translational center-of-mass motion. Not sure how well it does at
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bodies, and any thermostatting fix for the non-rigid particles
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(:doc:`fix nvt <fix_nh>`, :doc:`fix langevin <fix_langevin>`, :doc:`fix
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temp/berendsen <fix_temp_berendsen>`). You can also use one of the 4
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NVE rigid styles for the rigid bodies and thermostat them using
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:doc:`fix langevin <fix_langevin>` on the group that contains all the
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particles in the rigid bodies. The net force added by :doc:`fix
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langevin <fix_langevin>` to each rigid body effectively thermostats its
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translational center-of-mass motion. Not sure how well it does at
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thermostatting its rotational motion.
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If you with to perform NPT or NPH dynamics (barostatting), you cannot
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If you wish to perform NPT or NPH dynamics (barostatting), you cannot
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use both :doc:`fix npt <fix_nh>` and the NPT or NPH rigid styles. This
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is because there can only be one fix which monitors the global
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pressure and changes the simulation box dimensions. So you have 3
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@ -727,27 +732,28 @@ choices:
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* Use one of the 4 NPT or NPH styles for the rigid bodies. Use the
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*dilate* all option so that it will dilate the positions of the
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non-rigid particles as well. Use :doc:`fix nvt <fix_nh>` (or any other
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thermostat) for the non-rigid particles.
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*non-rigid particles as well. Use :doc:`fix nvt <fix_nh>` (or any
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*other thermostat) for the non-rigid particles.
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* Use :doc:`fix npt <fix_nh>` for the group of non-rigid particles. Use
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the *dilate* all option so that it will dilate the center-of-mass
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positions of the rigid bodies as well. Use one of the 4 NVE or 2 NVT
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rigid styles for the rigid bodies.
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* Use :doc:`fix press/berendsen <fix_press_berendsen>` to compute the
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pressure and change the box dimensions. Use one of the 4 NVE or 2 NVT
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rigid styles for the rigid bodies. Use :doc:`fix nvt <fix_nh>` (or any
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other thermostat) for the non-rigid particles.
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rigid styles for the rigid bodies. Use :doc:`fix nvt <fix_nh>` (or
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any other thermostat) for the non-rigid particles.
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In all case, the rigid bodies and non-rigid particles both contribute
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to the global pressure and the box is scaled the same by any of the
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barostatting fixes.
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You could even use the second and third options for a non-hybrid simulation
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consisting of only rigid bodies, assuming you give :doc:`fix npt <fix_nh>` an empty group, though it's an odd thing to do. The
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barostatting fixes (:doc:`fix npt <fix_nh>` and :doc:`fix press/berensen <fix_press_berendsen>`) will monitor the pressure
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and change the box dimensions, but not time integrate any particles.
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The integration of the rigid bodies will be performed by fix
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rigid/nvt.
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You could even use the second and third options for a non-hybrid
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simulation consisting of only rigid bodies, assuming you give :doc:`fix
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npt <fix_nh>` an empty group, though it's an odd thing to do. The
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barostatting fixes (:doc:`fix npt <fix_nh>` and :doc:`fix press/berensen
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<fix_press_berendsen>`) will monitor the pressure and change the box
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dimensions, but not time integrate any particles. The integration of
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the rigid bodies will be performed by fix rigid/nvt.
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----------
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