Line charts are a basic way to visualize one or more variables over a specified time period. Values within each variable are graphed on the same axis, allowing comparison of multiple elements at a time.

To create a new line chart select the variables that will be displayed on the graph. Be sure to select variables with the same units of measure.

**Tip**: Select variables with similar magnitudes as the axis will automatically scale to the values.

Once the component variables are selected, enter a title, timeframe, and frequency. The timeframe dropdown menu has several commonly used time periods for quick configuration. Custom timeframes, including those smaller than the current hour, can be set by selecting the "Custom" option.

The frequency setting defines the size of the intervals on the horizontal axis. A frequency of five minutes, for example, will graph a data point every five minutes for the set timeframe. Charts in ioTORQ will aggregate a dataset based on the chosen aggregation of each component variable.

**Example**: A variable is recording the flow rate of water through a pipe. It has units of gal/min, a Frequency of 1 minute, and an Aggregation set to Average. This variable is added to a Line Chart with a timeframe of 1 day. Selecting a Frequency of 1 minute will show the actual value of the flow rate at each particular minute over the course of the day (and thus will have 1,440 data points). Selecting a Frequency of 1 hour will show a single value per hour calculated by taking the average of the 60 data points included in that hour (and thus will result in a graph with 24 data points).

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