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<title>X_LIST</title>
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<h1 align=center>X_LIST</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#REFERENCES">REFERENCES</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_list</b>
− Extract Cross-Over Information from the Data
Base.</p>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_list</b> [
<i>leg1</i> ] [ <i>leg2</i> ] [
<b>−</b><i>dataflags</i> ] [
<b>−R</b><i>west/east/south/north</i> ] [
<b>−X</b><i>xbase</i> ] [ <b>−H</b> ] [
<b>−I</b> ] [ <b>−V</b> ] [
<b>−C</b><i>corrfile</i> ] [
<b>−Z</b><i>ignorefile</i> ]</p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x_list</b>
will allow the user to extract information from the
xx_base.b and xx_legs.b files. Several options can be passed
on the command line in order to specify which parameters to
extract. They are: <i><br>
leg1 leg2</i></p>
<p style="margin-left:22%;">If two legs are specified, the
cross-overs they have in common are returned. If one leg is
specified, all the external cross-overs involving this leg
are returned, OR only its internal cross-overs if −I
is selected. If no legs are given, all the external (or
internal with −I) cross-overs are returned. This
program is useful if one wants to look at, say, gravity COEs
versus time from port for a particular leg, etc.</p>
<p style="margin-left:11%;"><i>dataflags</i></p>
<p style="margin-left:22%;">This is a string of any
combination of the following:</p>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>l</b> means list both legnames.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>t</b> means list time.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>x</b> means list longitude.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>y</b> means list latitude.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>g</b> means list gravity COEs.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>m</b> means list magnetics COEs.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>b</b> means list bathymetry COEs.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>G</b> means list average gravity at
cross-over.</p> </td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>M</b> means list average magnetic
anomaly at cross-over.</p></td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>B</b> means list average bathymetry at
cross-over.</p> </td>
<tr valign="top" align="left">
<td width="8%"></td>
<td width="7%"></td>
<td width="85%">
<p valign="top"><b>h</b> means list heading of ship at
cross-over.</p> </td>
</table>
<p style="margin-left:22%;">The components are written out
in the order they appear in <i>dataflags</i>. The default
output is <b>−txygmbGMBhl</b>. When internal COEs are
desired, the time reported is the elapsed time since the
ship first occupied the cross-over point. For external COEs
the time means time from the start of the year in
seconds.</p>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−R</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Only return
cross-overs inside the specified region <i>west, east,
south,</i> and <i>north</i>. [Default is world].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−X</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Indicate alternate
<i>xx_base.b</i> file.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−H</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Issue one header
record on output.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−I</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Report on internal
COEs [Default is external COEs].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−C</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Apply cross-over
correction to the data (i.e., reports the cross-over value
after the best-fitting corrections have been applied to both
legs). If no <i>corrfile</i> is given, the default
correction file is assumed.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−Z</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Ignore those legs
that appear in the <i>ignorefile</i>.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−V</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Selects verbose
mode, which will send progress reports to stderr [Default
runs "silently"].</p></td>
</table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1),
<i><A HREF="x_system.html">x_system</A></i>(1)</p>
<a name="REFERENCES"></a>
<h2>REFERENCES</h2>
<p style="margin-left:11%; margin-top: 1em">Wessel, P.
XOVER: A Cross-over Error Detector for Track Data,
<i>Computers & Geosciences, 15</i>, 333-346.</p>
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