anychart.onDocumentReady(function () {
var chart = anychart.waterfall([166, 43, -79, -46, 84, NaN]);
var bottomXAxis = chart.xAxis();
bottomXAxis.ticks({stroke: "#2196F3"});
var topXAxis = chart.xAxis(1);
topXAxis.orientation("top");
topXAxis.stroke("#2196F3");
chart.title("Get and modify chart xAxis");
chart.container("container");