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<title>tmatch2: Crossmatches 2 tables using flexible criteria</title>
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<h2><a name="tmatch2">B.31 <code>tmatch2</code>: Crossmatches 2 tables using flexible criteria</a></h2>
<p><code>tmatch2</code> is an efficient and highly configurable
tool for crossmatching pairs of tables.
It can match rows between tables on the basis of their relative position
in the sky, or alternatively using many other criteria such as
separation in some isotropic or anisotropic Cartesian space,
identity of a key value, or some combination of these;
the full range of match criteria is discussed in <a href="MatchEngine.html">Section 7.1</a>.
You can choose whether you want to identify all the matches or
only the closest,
and what form the output table takes, for instance matched rows only,
or all rows from one or both tables, or only the unmatched rows.
</p>
<p>If you simply want to match two tables based on sky position with
a fixed maximum separation, you may find the
<a href="tskymatch2.html"><code>tskymatch2</code></a> command easier to use.
</p>
<p><strong>Note:</strong> the <code>duptag1</code> and <code>duptag2</code>
parameters have been replaced at version 1.4 by
<code>suffix1</code> and <code>suffix2</code>
for consistency with other table join tasks.
</p>
<ul>
<li><a href="tmatch2-usage.html">B.31.1 Usage</a></li>
<li><a href="secB.31.2.html">B.31.2 Examples</a></li>
</ul>
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<b>Up: </b><a href="cmdUsage.html">Command Reference</a><br>
<b>Previous: </b><a href="secB.30.2.html">Examples</a><br>
<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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