<page_title> List of Lost episodes </page_title> <section_title> Series overview </section_title> <table> <cell> 4 <col_header> Season </col_header> <col_header> Last aired </col_header> </cell> <cell> 13.40 <col_header> Nielsen ratings </col_header> </cell> </table>
The fourth season of Lost averaged a total of 13.40 million viewers.