Hello Mariko,

Vertical line can be set by having a two dots in the dataSource representing the beginning and the end of line. A series of scatterLine can be added.

In order to set line width thickness can be set to 20 and for color brush can be set to red.

$(function () {
  var data = [
    { x: 5, y: 0 },
    { x: 5, y: 100 },
  ];

  $("#chart").igDataChart({
    width: "100%",
    height: "400px",
    dataSource: data,
    axes: [
      {
        name: "x",
        type: "numericX",
        minimumValue: -100,
        maximumValue: 100
      },
      {
        name: "y",
        type: "numericY"
      }
    ],
    series: [
      {
        name: "verticalLine",
        title: "verticalLine",
        type: "scatterLine",
        xAxis: "x",
        yAxis: "y",
        xMemberPath: "x",
        yMemberPath: "y",
        brush: "red",
        thickness: 20
      }
    ]
  });
});