Reference Lines
All chart-type widgets in TagoIO can be configured to display reference lines within the graph. These lines can serve as thresholds, upper and lower bounds, medians, or any other value that can enhance the data visualization experience.
The widgets that support this feature include the Area Chart, Line Chart, Horizontal Bar, Vertical Column, and Multiple Charts.
Adding reference lines to your chart
You can set reference lines by navigating to your widget's edit page and accessing the 'Reference Lines' option. Up to 5 lines per widget are allowed.
To set a new line, you need to define the reference value. This can be selected in one of two ways: as a fixed value, which is static and manually defined in the widget options, or as a variable from your device, allowing you to set dynamic lines that reflect the value of the variable.
Reference lines that use 'Fixed' as the source can have a Label and Color set manually. If you choose a variable as the source, then the label and color will be determined by the variable's metadata. Read more about Metadata.
When using multiple axes, you can choose which axis the reference line should be associated with by accessing the 
icon inside the reference line options and selecting the appropriate axis.
Additionally, within these settings, you can apply a formula to your reference line's value. This is especially useful when the dataset variables have a Formula applied, or when paired with Dynamic Formulas for custom unit conversions.
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