score:2

the 3.45 point does appear on the chart - if you hover over where it supposed to be you can see it highlighted. issue is there is no line connecting to it from your 7.89 because connectnulls is false by default. to see the points connected turn this to true. you can also enable a marker per point not just per series:

series: [{
  data: [{
    y: 2.45
  }, {
    y: 7.89
  }, {
    y: null
  }, {
    y: 3.45,
    marker: {
      enabled: true
    }
  }]

sample fiddle.


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