I need to tweak this code that creats a csv file - Part I

This code works like a champ:

$michelle="select actor_id, actor_display_name, posted_time, geo_coords_lat, geo_coords_lon, location_name from twitter_csv_test where geo_coords_lat BETWEEN '$lat_1' AND '$lat_2' and geo_coords_lon BETWEEN '$lon_2' and '$lon_1'";
$michelle_query=mysqli_query($cxn, $michelle);
if(!$michelle_query)
{
$rats=mysqli_errno($cxn).': '.mysqli_error($cxn);
die($rats);
}
$michelle_columns=mysqli_field_count($cxn);

//gets the field names from your table and sets them up as the first row in your csv file

$heading=mysqli_fetch_fields($michelle_query);

foreach ($heading as $val)
{
	$output .='"'.$val->name .'",';
}
$output .="\n";


while($michelle_row=mysqli_fetch_array($michelle_query))
{
	for($i=0; $i<$michelle_columns; $i++)
	{
		$output .='"'.$michelle_row["$i"].'",';
	}
$output .="\n";
}

$filename="twitter.csv";
header('Content-type:application/csv');
header('Content-Disposition: attachment; filename='.$filename);
echo $output;

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The challenge, however, is that my user wants the headers named "lat" and "long" as opposed to "geo_coords_lat" and "geo_coords_lon." How can I dictate the way the headers appear without changing their name in the database?