mysql to excel question

I'm exporting info from a mysql db to excel. All works fine.

Is there anyway of adding to the script something which will add three fields/cells to excel which arent part of the db.

for example

add a excel heading of 'sample'  and a cell value of 'X' to each record.

See script below.

<?
$check = mysql_pconnect("sample", "sample", "sample") or die(mysql_error());
mysql_select_db("sample", $check) or die(mysql_error());

$Recordset1 = mysql_query("SELECT date, subtotal as Amount, total as IncTax Amount, companyname as Cofusedmedia, description FROM tblinvoices t1, tblclients t2, tblinvoiceitems t3
where t1.userid = t2.id
and t1.userid = t3.userid", $check) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
$fields = mysql_num_fields($Recordset1);

for ($i = 0; $i < $fields; $i++) {
   $header .= mysql_field_name($Recordset1, $i) . "\t";
}

 do {
    $line = '';
    foreach($row_Recordset1 as $value) {                                            
        if ((!isset($value)) OR ($value == "")) {
            $value = "\t";
        } else {
            $value = str_replace('"', '""', $value);
            $value = '"' . $value . '"' . "\t";
        }
        $line .= $value;
    }
    $data .= trim($line)."\n";
} while($row_Recordset1 = mysql_fetch_assoc($Recordset1));
$data = str_replace("\r","",$data);

if ($data == "") {
    $data = "\n(0) Records Found!\n";  
      }
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=report.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";
?>
<?php
mysql_free_result($Recordset1);
?>