anychart.onDocumentReady(function () {
var data1 = [166, 43, -79, -46, 84, NaN];
var data2 = [50, -25, 30, 28, 83, NaN];
var chart = anychart.waterfall();
chart.addSeries(data1, data2);
var secondSeries = chart.getSeriesAt(1);
secondSeries.labels(true);
chart.title("Get and modify series by index");
chart.container("container");