anychart.onDocumentReady(function () {
var dataTable = anychart.data.table();
dataTable.addData(get_dji_daily_short_data());
var mapping = dataTable.mapAs({open: 1, high: 2, low: 3, close: 4});
var chart = anychart.stock();
var priceChannels = plot.priceChannels(mapping);
var middleSeries = priceChannels.middleSeries();
middleSeries.stroke('3 #66cd00');
chart.title('Get and modify middle series');
chart.container('container');