wORsCAuDQCD+QILmD1A9kECEZgxDaEZhICIzGcIyEyOl2RkgwAAhkmC+eAm0TAAAAABJRU5ErkJggg==');
        a.append(img);
        $(this).append(a);
      }
    });

    // hide elements of author/affiliations grid that have no value
    function hide_byline_column(caption) {
      $('d-byline').find('h3:contains("' + caption + '")').parent().css('visibility', 'hidden');
    }

    // affiliations
    var have_affiliations = false;
    for (var i = 0; i<front_matter.authors.length; ++i) {
      var author = front_matter.a