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The line of the note.

<div id="chart"></div>
<script>
$("#chart").kendoChart({
    series: [{
        data: [1, 2, 3]
    }],
    yAxis: {
        notes: {
            data: [{
                value: 2,
                line: {
                    color: "red",
                    width: 3,
                    length: 40
                }
            }]
        }
    }
});
</script>

The line color of the note.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          line: {
            color: "teal"
          }
        }]
      }
    }
  });
</script>

The length of the connecting lines in pixels.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          line: {
            length: 50
          }
        }]
      }
    }
  });
</script>

The line width of the note.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          line: {
            width: 3
          }
        }]
      }
    }
  });
</script>