font></PRE>
</TD>
</TR>
</TABLE>
<p>

or you could use a system tool, e.g. gawk, as in this example (see <a href="SystemTools.html#Awk">Awk</a>).
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
<TR>
<TD>
<PRE>
<font color="#82140F">
open "gawk '{print($1,2*$2)}' file|"
read columns x y
draw curve
</font></PRE>
</TD>
</TR>
</TABLE>
<p>
The latter is preferable in the sense that it is more powerful.  The
reason for this is that Gri allows you to manipulate the x and y
columns, using so