apply_filters( 'twentythirteen_author_bio_avatar_size', int $size )

15		 * Filters the author bio avatar size.16		 *17		 * @since Twenty Thirteen 1.018		 *19		 * @param int $size The avatar height and width size in pixels.20		 */21		$author_bio_avatar_size = apply_filters( 'twentythirteen_author_bio_avatar_size', 74 );22		echo get_avatar( get_the_author_meta( 'user_email' ), $author_bio_avatar_size );23		?>24	</div><!-- .author-avatar -->25	<div class="author-description">26		<h2 class="author-title">27		<?php