This code snippet is fully functional:
var chart = am4core.createFromConfig({
"data" : [{
"category": 0.5,
"value1": 8,
"value2": 6.7
}, {
"category": 1,
"value1": 8,
"value2": 6.7
}, {
"category": 1.5,
"value1": 8,
"value2": 6.7
}, {
"category": 2,
"value1": 8,
"value2": 6.7
}, {
"category": 2.5,
"value1": 8,
"value2": 5
}, {
"category": 3,
"value1": 6.5,
"value2": 3.7
}, {
"category": 3.5,
"value1": 5,
"value2": 2.9
}, {
"category": 4,
"value1": 3.9,
"value2": 2.3
}],
"xAxes": [{
"type": "CategoryAxis",
"id": "id-1",
"title": {
"type": "Label",
"id": "span",
"text": "Span in Metres"
},
"dataFields": {
"category": "category"
},
"startLocation": 0.5,
"endLocation": 0.5,
"renderer": {
"grid": {
"template": {
"type": "Grid",
"location": 0.5
}
},
"minGridDistance": 20
}
}],
"yAxes": [{
"type": "ValueAxis",
"id": "id-2",
"title": {
"type": "Label",
"id": "swl",
"text": "S.W.L in Tonnes",
"propertyFields": {}
},
"min": "0",
"max": "10",
"renderer": {
"maxLabelPosition": 0.98
}
}],
"series": [{
"type": "LineSeries",
"name": "30° Sling To Vertical Angle",
"xAxis": "id-1",
"yAxis": "id-2",
"baseAxis": "id-1",
"dataFields": {
"valueY": "value1",
"categoryX": "category"
},
"fillOpacity": 0.5,
"strokeWidth": 2,
"sequencedInterpolation": true,
"sequencedInterpolationDelay": 100,
"tooltipText": "{name}\n{categoryX}: {valueY}"
}, {
"type": "LineSeries",
"name": "45° Sling To Vertical Angle",
"xAxis": "id-1",
"yAxis": "id-2",
"dataFields": {
"valueY": "value2",
"categoryX": "category"
},
"simplifiedProcessing": true,
"calculatePercent": true,
"fillOpacity": 0.5,
"strokeWidth": 2,
"sequencedInterpolation": true,
"sequencedInterpolationDelay": 100,
"tooltipText": "{name}\n{categoryX}: {valueY}"
}],
"legend": {
"type": "Legend",
"setStateOnChildren": true,
"showOnInit": true,
"visible": true,
"disabled": false,
"dataFields": {},
"position": "top"
},
"cursor": {
"type": "XYCursor",
"tooltipPosition": "fixed"
},
"dataFields": {},
"colors": {
"type": "ColorSet",
"wrap": false,
"shuffle": false,
"reuse": false,
"baseColor": "#6b7894"
}
}, "$CHART$", am4charts.XYChart);
Check out the live example:
https://jsfiddle.net/a4ujzoxh/