text: const nullNode = null;
  
  export default {
    rangeSelector: {
      selected: 1,
    },
    title: {
      text: 'BTC-USD'
    },
    series: [{
      type: 'candlestick',
      name: 'BTC',
      data: [
        {x: 1, open: 10, high: 15, low: 8, close: 12, name: 'Feb 12, 2017 '},
        {x: 2, open: 12, high: 22, low: 10, close: 18, name: 'Feb 13, 2017 '},
      ],
      dataGrouping: {
          units: [
              [
                  'week', // unit name
                  [1] // allowed multiples
              ], [
                  'month',
                  [1, 2, 3, 4, 6]
              ]
          ]
      }
    }]
  }  
  /*
  0: {x: 1, open: "401.00", high: "414.00", low: "371.00", close: "385.00", …}
  1: {x: 2, open: "385.00", high: "397.00", low: "376.00", close: "379.00", …}
  2: {x: 3, open: "379.00", high: "392.00", low: "372.00", close: "373.00", …}
  3: {x: 4, open: "373.00", high: "385.00", low: "350.00", close: "363.00", …}
  */