diff --git a/doc/src/compute_voronoi_atom.txt b/doc/src/compute_voronoi_atom.txt
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--- a/doc/src/compute_voronoi_atom.txt
+++ b/doc/src/compute_voronoi_atom.txt
@@ -1,228 +1,228 @@
 "LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
 
 :link(lws,http://lammps.sandia.gov)
 :link(ld,Manual.html)
 :link(lc,Section_commands.html#comm)
 
 :line
 
 compute voronoi/atom command :h3
 
 [Syntax:]
 
 compute ID group-ID voronoi/atom keyword arg ... :pre
 
 ID, group-ID are documented in "compute"_compute.html command :ulb,l
 voronoi/atom = style name of this compute command :l
 zero or more keyword/value pairs may be appended :l
 keyword = {only_group} or {surface} or {radius} or {edge_histo} or {edge_threshold}
 or {face_threshold} or {neighbors} or {peratom} :l
   {only_group} = no arg
   {occupation} = no arg
   {surface} arg = sgroup-ID
     sgroup-ID = compute the dividing surface between group-ID and sgroup-ID
       this keyword adds a third column to the compute output
   {radius} arg = v_r
     v_r = radius atom style variable for a poly-disperse Voronoi tessellation
   {edge_histo} arg = maxedge
     maxedge = maximum number of Voronoi cell edges to be accounted in the histogram
   {edge_threshold} arg = minlength
     minlength = minimum length for an edge to be counted
   {face_threshold} arg = minarea
     minarea = minimum area for a face to be counted
   {neighbors} value = {yes} or {no} = store list of all neighbors or no
   {peratom} value = {yes} or {no} = per-atom quantities accessible or no :pre
 :ule
 
 [Examples:]
 
 compute 1 all voronoi/atom
 compute 2 precipitate voronoi/atom surface matrix
 compute 3b precipitate voronoi/atom radius v_r
 compute 4 solute voronoi/atom only_group
 compute 5 defects voronoi/atom occupation
 compute 6 all voronoi/atom neighbors yes :pre
 
 [Description:]
 
 Define a computation that calculates the Voronoi tessellation of the
 atoms in the simulation box.  The tessellation is calculated using all
 atoms in the simulation, but non-zero values are only stored for atoms
 in the group.
 
 By default two per-atom quantities are calculated by this compute.
 The first is the volume of the Voronoi cell around each atom.  Any
 point in an atom's Voronoi cell is closer to that atom than any other.
 The second is the number of faces of the Voronoi cell. This is
 equal to the number of nearest neighbors of the central atom,
 plus any exterior faces (see note below). If the {peratom} keyword
 is set to "no", the per-atom quantities are still calculated,
 but they are not accessible.
 
 :line
 
 If the {only_group} keyword is specified the tessellation is performed
 only with respect to the atoms contained in the compute group. This is
 equivalent to deleting all atoms not contained in the group prior to
 evaluating the tessellation.
 
 If the {surface} keyword is specified a third quantity per atom is
 computed: the Voronoi cell surface of the given atom. {surface} takes
 a group ID as an argument. If a group other than {all} is specified,
 only the Voronoi cell facets facing a neighbor atom from the specified
 group are counted towards the surface area.
 
 In the example above, a precipitate embedded in a matrix, only atoms
 at the surface of the precipitate will have non-zero surface area, and
 only the outward facing facets of the Voronoi cells are counted (the
 hull of the precipitate). The total surface area of the precipitate
 can be obtained by running a "reduce sum" compute on c_2\[3\]
 
 If the {radius} keyword is specified with an atom style variable as
 the argument, a poly-disperse Voronoi tessellation is
 performed. Examples for radius variables are
 
 variable r1 atom (type==1)*0.1+(type==2)*0.4
 compute radius all property/atom radius
 variable r2 atom c_radius :pre
 
 Here v_r1 specifies a per-type radius of 0.1 units for type 1 atoms
 and 0.4 units for type 2 atoms, and v_r2 accesses the radius property
 present in atom_style sphere for granular models.
 
 The {edge_histo} keyword activates the compilation of a histogram of
 number of edges on the faces of the Voronoi cells in the compute
 group. The argument {maxedge} of the this keyword is the largest number
 of edges on a single Voronoi cell face expected to occur in the
 sample. This keyword adds the generation of a global vector with
 {maxedge}+1 entries. The last entry in the vector contains the number of
 faces with with more than {maxedge} edges. Since the polygon with the
 smallest amount of edges is a triangle, entries 1 and 2 of the vector
 will always be zero.
 
 The {edge_threshold} and {face_threshold} keywords allow the
 suppression of edges below a given minimum length and faces below a
 given minimum area. Ultra short edges and ultra small faces can occur
 as artifacts of the Voronoi tessellation. These keywords will affect
 the neighbor count and edge histogram outputs.
 
 If the {occupation} keyword is specified the tessellation is only
 performed for the first invocation of the compute and then stored.
 For all following invocations of the compute the number of atoms in
 each Voronoi cell in the stored tessellation is counted. In this mode
 the compute returns a per-atom array with 2 columns. The first column
 is the number of atoms currently in the Voronoi volume defined by this
 atom at the time of the first invocation of the compute (note that the
 atom may have moved significantly). The second column contains the
 total number of atoms sharing the Voronoi cell of the stored
 tessellation at the location of the current atom. Numbers in column
 one can be any positive integer including zero, while column two
 values will always be greater than zero. Column one data can be used
 to locate vacancies (the coordinates are given by the atom coordinates
 at the time step when the compute was first invoked), while column two
 data can be used to identify interstitial atoms.
 
 If the {neighbors} value is set to yes, then
 this compute creates a local array with 3 columns. There
 is one row for each face of each Voronoi cell. The
 3 columns are the atom ID of the atom that owns the cell,
 the atom ID of the atom in the neighboring cell
 (or zero if the face is external), and the area of the face.
 The array can be accessed by any command that
 uses local values from a compute as input.  See "this
 section"_Section_howto.html#howto_15 for an overview of LAMMPS output
 options. More specifically, the array can be accessed by a
 "dump local"_dump.html command to write a file containing
 all the Voronoi neighbors in a system:
 
 compute 6 all voronoi/atom neighbors yes
 dump d2 all local 1 dump.neighbors index c_6\[1\] c_6\[2\] c_6\[3\] :pre
 
 If the {face_threshold} keyword is used, then only faces
 with areas greater than the threshold are stored.
 
 :line
 
 The Voronoi calculation is performed by the freely available "Voro++
 package"_voronoi, written by Chris Rycroft at UC Berkeley and LBL,
 which must be installed on your system when building LAMMPS for use
 with this compute.  See instructions on obtaining and installing the
 Voro++ software in the src/VORONOI/README file.
 
 :link(voronoi,http://math.lbl.gov/voro++/)
 
 NOTE: The calculation of Voronoi volumes is performed by each
 processor for the atoms it owns, and includes the effect of ghost
 atoms stored by the processor.  This assumes that the Voronoi cells of
 owned atoms are not affected by atoms beyond the ghost atom cut-off
 distance.  This is usually a good assumption for liquid and solid
 systems, but may lead to underestimation of Voronoi volumes in low
 density systems.  By default, the set of ghost atoms stored by each
 processor is determined by the cutoff used for
 "pair_style"_pair_style.html interactions.  The cutoff can be set
 explicitly via the "comm_modify cutoff"_comm_modify.html command.  The
 Voronoi cells for atoms adjacent to empty regions will extend into
 those regions up to the communication cutoff in x, y, or z.  In that
 situation, an exterior face is created at the cutoff distance normal
 to the x, y, or z direction.  For triclinic systems, the exterior face
 is parallel to the corresponding reciprocal lattice vector.
 
 NOTE: The Voro++ package performs its calculation in 3d.  This will
 still work for a 2d LAMMPS simulation, provided all the atoms have the
 same z coordinate. The Voronoi cell of each atom will be a columnar
 polyhedron with constant cross-sectional area along the z direction
 and two exterior faces at the top and bottom of the simulation box. If
 the atoms do not all have the same z coordinate, then the columnar
 cells will be accordingly distorted. The cross-sectional area of each
 Voronoi cell can be obtained by dividing its volume by the z extent of
 the simulation box.  Note that you define the z extent of the
 simulation box for 2d simulations when using the
 "create_box"_create_box.html or "read_data"_read_data.html commands.
 
 [Output info:]
 
 By default, this compute calculates a per-atom array with 2
 columns. In regular dynamic tessellation mode the first column is the
 Voronoi volume, the second is the neighbor count, as described above
 (read above for the output data in case the {occupation} keyword is
 specified).  These values can be accessed by any command that uses
 per-atom values from a compute as input.  See "Section
 6.15"_Section_howto.html#howto_15 for an overview of LAMMPS output
 options. If the {peratom} keyword is set to "no", the per-atom array
 is still created, but it is not accessible.
 
 If the {edge_histo} keyword is used, then this compute generates a
 global vector of length {maxedge}+1, containing a histogram of the
 number of edges per face.
 
 If the {neighbors} value is set to yes, then this compute calculates a
 local array with 3 columns. There is one row for each face of each
 Voronoi cell.
 
 NOTE: Some LAMMPS commands such as the "compute
 reduce"_compute_reduce.html command can accept either a per-atom or
 local quantity. If this compute produces both quantities, the command
 may access the per-atom quantity, even if you want to access the local
 quantity.  This effect can be eliminated by using the {peratom}
 keyword to turn off the production of the per-atom quantities.  For
 the default value {yes} both quantities are produced.  For the value
 {no}, only the local array is produced.
 
 The Voronoi cell volume will be in distance "units"_units.html cubed.
 The Voronoi face area will be in distance "units"_units.html squared.
 
 [Restrictions:]
 
 This compute is part of the VORONOI package.  It is only enabled if
 LAMMPS was built with that package.  See the "Making
 LAMMPS"_Section_start.html#start_3 section for more info.
 
-It also requiers you have a copy of the Voro++ library built and
+It also requires you have a copy of the Voro++ library built and
 installed on your system.  See instructions on obtaining and
 installing the Voro++ software in the src/VORONOI/README file.
 
 [Related commands:]
 
 "dump custom"_dump.html, "dump local"_dump.html
 
 [Default:] {neighbors} no, {peratom} yes