<p>where <em>L</em> is the normalized distance from the atom to the point of
closest approach of bond <em>i</em> and <em>j</em>. The <em>mid</em> option takes <em>L</em> as
0.5 for each interaction as described in <aclass="reference internal"href="#sirk"><spanclass="std std-ref">(Sirk)</span></a>.</p>
<p>The following coefficients must be defined via the
<aclass="reference internal"href="pair_coeff.html"><spanclass="doc">pair_coeff</span></a> command as in the examples above, or in
the data file or restart file read by the <aclass="reference internal"href="read_data.html"><spanclass="doc">read_data</span></a>
or <aclass="reference internal"href="read_restart.html"><spanclass="doc">read_restart</span></a> commands:</p>
<ulclass="simple">
<li><em>C</em> (force units)</li>
<li><em>rc</em> (distance units)</li>
</ul>
<p>The last coefficient is optional. If not specified, the global cutoff
is used.</p>
<divclass="admonition note">
<pclass="first admonition-title">Note</p>
<pclass="last">Pair style srp considers each bond of type <em>btype</em> to be a
fictitious “particle” of type <em>bptype</em>, where <em>bptype</em> is either the
largest atom type in the system, or the type set by the <em>bptype</em> flag.
Any actual existing particles with this atom type will be deleted at
the beginning of a run. This means you must specify the number of
types in your system accordingly; usually to be one larger than what
would normally be the case, e.g. via the <aclass="reference internal"href="create_box.html"><spanclass="doc">create_box</span></a>
or by changing the header in your <aclass="reference internal"href="read_data.html"><spanclass="doc">data file</span></a>. The
ficitious “bond particles” are inserted at the beginning of the run,
and serve as placeholders that define the position of the bonds. This
allows neighbor lists to be constructed and pairwise interactions to
be computed in almost the same way as is done for actual particles.
Because bonds interact only with other bonds, <aclass="reference internal"href="pair_hybrid.html"><spanclass="doc">pair_style hybrid</span></a> should be used to turn off interactions
between atom type <em>bptype</em> and all other types of atoms. An error
will be flagged if <aclass="reference internal"href="pair_hybrid.html"><spanclass="doc">pair_style hybrid</span></a> is not used.</p>
</div>
<p>The optional <em>exclude</em> keyword determines if forces are computed
between first neighbor (directly connected) bonds. For a setting of
<em>no</em>, first neighbor forces are computed; for <em>yes</em> they are not
computed. A setting of <em>no</em> cannot be used with the <em>min</em> option for
distance calculation because the the minimum distance between directly
connected bonds is zero.</p>
<p>Pair style <em>srp</em> turns off normalization of thermodynamic properties
by particle number, as if the command <aclass="reference internal"href="thermo_modify.html"><spanclass="doc">thermo_modify norm no</span></a> had been issued.</p>
<p>The pairwise energy associated with style <em>srp</em> is shifted to be zero
<p>This pair style does not support the <aclass="reference internal"href="pair_modify.html"><spanclass="doc">pair_modify</span></a>
shift option for the energy of the pair interaction. Note that as
discussed above, the energy term is already shifted to be 0.0 at the
cutoff distance <em>rc</em>.</p>
<p>The <aclass="reference internal"href="pair_modify.html"><spanclass="doc">pair_modify</span></a> table option is not relevant for
this pair style.</p>
<p>This pair style does not support the <aclass="reference internal"href="pair_modify.html"><spanclass="doc">pair_modify</span></a>
tail option for adding long-range tail corrections to energy and
pressure.</p>
<p>This pair style writes global and per-atom information to <aclass="reference internal"href="restart.html"><spanclass="doc">binary restart files</span></a>. Pair srp should be used with <aclass="reference internal"href="pair_hybrid.html"><spanclass="doc">pair_style hybrid</span></a>, thus the pair_coeff commands need to be
specified in the input script when reading a restart file.</p>
<p>This pair style can only be used via the <em>pair</em> keyword of the
<aclass="reference internal"href="run_style.html"><spanclass="doc">run_style respa</span></a> command. It does not support the
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