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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

//* Modify the size of the Gravatar in the entry comments
add_filter( 'genesis_comment_list_args', 'mobile_first_comments_gravatar' );
function mobile_first_comments_gravatar( $args ) {

    $args['avatar_size'] = 100;
    return $args;

}