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B.1.2 Binary tables
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  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> programs also support native binary tables to speed up input-output
for i/o-intensive tasks like gridding and preprocessing.  Files
may have no header (hence the <B>-H</B> option cannot be used)
and all data must either be single or double precision (no mixing
allowed).  Multiple segment files are allowed (<B>-m</B>) and the
segment headers are assumed to be records where all the fields equal 
NaN.  Flags appended to <B>-m</B> are ignored.  The format and number
of fields are specified with the <B>-b</B> option.
Thus, for input you may set <B>-bi</B>[<B>s</B>][<I>n</I>],
where <B>s</B> designates single precision (default is <B>d</B> for double) and
<I>n</I> is the number of fields.  For output, use <B>-bo</B>[<B>s</B>] 
(the programs know how many columns to write, unless you use <B>-m</B> in which
case we need to know the number of output columns up front).  If you need
to swap the byte-order on either input or output you must use upper case
<B>S</B> or <B>D</B> instead.

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<ADDRESS>
Paul Wessel
2010-07-14
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