$options['PNG - for plain paper printing'] = "PNG";

/* AAAARRGGGHH! No plugin support from FedEx for these...
may add in the future.
$options['ELTRON - for thermal printing'] = "ELTRON";
$options['Zebra - for thermal printing'] = "ZEBRA";
$options['UniMark - for thermal printing'] = "UNIMARK";
*/