values,
<code>pipe</code> for values separated by the vertical bar character <code>|</code>,
<code>semicolon</code> for values separated by semicolon <code>;</code>, 
and <code>space</code> for values separated by space or tab characters.
If the file name ends in <code>.csv</code> and <var>separator_flag</var> is not specified,
<code>comma</code> is assumed.
If the file name ends in something other than <code>.csv</code> and <code>separator_flag</code> is not specified,
<code>space</code> is assumed.
</p>
<