Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "curved-line-series">
    <p>With this node you can add a curved line series graph to an existing dashboard or a new one created by the node to show curved line series graph.
    </p>

    <h3>Configurations</h3>

    <dl class="message-properties">
        <dt>dashboard
            <span class="property-type">string</span>
        </dt>
        <dd>Dashboard title to which the curved line series graph will be added</dd>
        <dt>widget
            <span class="property-type">string</span>
        </dt>
        <dd> Title that will have the widget containing the curved line series graph.</dd>
    </dl>

    <h3>Inputs</h3>
    <dl class="message-properties">
        A JSON array like the following:
        <pre>
[
    {
        "metricHighLevelType": "Sensor",
        "metricName": [The name of the Sensor],
        "smField": [A measure recorded by the sensor],
        "serviceUri": [Service Uri Of A Sensor]
    },
    {
        "metricHighLevelType": "MyKPI",
        "metricName": [The name of the MyKPI],
        "smField": [The type of the measure saved in the KPI],
        "serviceUri": [The ID of a KPI]
    },
    {
        "metricHighLevelType": "Dynamic",
        "metricName": [The name of the dynamic data],
        "smField": [The type of the dynamic data],
        "metricValueUnit": [The unit of the dynamic data],
        "value": [An array of array of timestamp and value]
    }
]
        </pre>

    <p>You can insert an arbitrary number of MyKPI and Sensor element inside the array.
    An example of the JSON array filled with correct data( copy in a function node for try):</p>

        <pre>
var now = new Date();
var base =60*60*100;

msg.payload = [
    {
        "serviceUri": "http://www.disit.org/km4city/resource/tusc_weather_sensor_ow_3166540",
        "metricHighLevelType": "Sensor",
        "metricName": "tusc_weather_sensor_ow_3166540",
        "smField": "airTemperature",
    },
    {
        "serviceUri": "http://www.disit.org/km4city/resource/tusc_weather_sensor_ow_3176959",
        "metricHighLevelType": "Sensor",
        "metricName": "tusc_weather_sensor_ow_3176959",
        "smField": "airTemperature"
    },
    {
        "serviceUri": "17057458",
        "metricHighLevelType": "MyKPI",
        "metricName": "S4CTuscanyTrackerLocation",
        "metricType": "Temperature"
    },
    {
        "metricId": "",
        "metricHighLevelType": "Dynamic",
        "metricName": "BatteryTemperatureGalaxyNote",
        "smField": "Gradi Centigradi",
        "metricValueUnit": "°C",
        "values": [
                    [now-64*base, 19.5],
                    [now-60*base, 20.0],
                    [now-56*base, 20.5],
                    [now-52*base, 18.5],
                    [now-48*base, 19],
                    [now-44*base, 18.5],
                    [now-40*base, 21.5],
                    [now-36*base, 22.0],
                    [now-32*base, 19],
                    [now-28*base, 17.5],
                    [now-24*base, 16.5],
                    [now-20*base, 17.0],
                    [now-16*base, 18.5],
                    [now-12*base, 20.0],
                    [now-8*base, 19.5],
                    [now-4*base, 21.5],
                    [now-1*base, 21]
        ]
    }
]
return msg;
        </pre>
    </dl>