bumped_node = cur[4];

			divergent_node = cur[5];

			extinct_node = cur[6];

			unstable_node = cur[7];

			// center dots on the first element in a td (not necessarily the first one, but there must be one)

			var rowY = Math.floor(row.offsetTop + firstincell.offsetTop + firstincell.offsetHeight/2);

			var nextY = Math.floor((next == null) ? rowY + row.offsetHeight/2 : next.offsetTop + nextFirstincell.offsetTop + nextFirstincell.offsetHeight/2);

			for (var j in in_l) {

				line = in_l[j];

				start = line[0];