title: How to set interval points on the x-axis in HighCharts?
body: <p>I have a bubble chart and would like to set the interval points on the x-axis to a predefined list.  For example, the list is [90, 100, 103, 108, 110, 112, 116, 120].  Here's my  code:</p>
  
  <pre><code>jQuery("#center_col_wrapper").highcharts({
  
  chart: {
    type: 'bubble'
  },
  
  title: {
  text: 'Highcharts Bubbles'
  },
  xAxis: {
  allowDecimals: false,
  title: {
    text: "BUBBLE CHART"
  },
  
  categories: ['90', '100', '110']
  },
  yAxis: {
  title: {
    text: ""
  },
  labels: {
    enabled: false
  }
  },
  series: [
  {
    name:"S1", data: [[100,10,87]]
  }, 
  {
    name:"S2", data: [[100,11,87]]
  },
  {
    name:"S3", data: [[110,12,87]]
  },
  {
    name:"S4", data: [[110,13,87]]
  }
  ]
  
  });
  </code></pre>
  
  <p>Here's my jsfiddle: <a href="http://jsfiddle.net/mLP7U/" rel="nofollow">http://jsfiddle.net/mLP7U/</a></p>