.  You can tell Gri how many lines to
read with a command like `<font color="#82140F"><code>read columns 10 x y</code></font>'.  Multiple datasets
can reside within one file; provided that they are separated by a single
blank line, Gri can access them by multiple `<font color="#82140F"><code>read</code></font>' commands.
<p>
Like C, Gri expects numbers to be separated by one or more spaces or
tabs.  Commas are not allowed.  If the columns were reversed, the
command would be `<font color="#82140F"><code>read