<p>A section begins with a non-blank line whose 1st character is not a
“#”; blank lines or lines starting with “#” can be used as comments
between sections. The first line begins with a keyword which
identifies the section. The line can contain additional text, but the
initial text must match the argument specified in the fix command.</p>
<p>The next line lists the number of table entries and the species names
that correspond with all the species listed in the reaction equations
through the <em>fix rx</em> command.
The parameter “N” is required and its value is the number of table
entries that follow. Let Nfile = “N” in the tabulated file.
What LAMMPS does is a preliminary interpolation by creating splines
using the Nfile tabulated values as nodal points.</p>
<p>Following a blank line, the next N lines list the tabulated values.
On each line, the 1st value is the index from 1 to N, the 2nd value is
the internal temperature (in temperature units), the 3rd value until
the <em>m+3</em> value are the internal energies of the m species (in energy units).</p>
<p>Note that all internal temperature and internal energy values must
increase from one line to the next.</p>
<p>Note that one file can contain many sections, each with a tabulated
potential. LAMMPS reads the file section by section until it finds
one that matches the specified keyword.</p>
<hr class="docutils" />
<p>The format of a heat of formation file is as follows (without the
parenthesized comments):</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># HEAT OF FORMATION TABLE (one or more comment or blank lines)</span>
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