When the Chart type is selected, a Chart / Sparkline subsection appears on the Properties tab.
Datasource
Select the data source that contains the tag data you want to display.
Tag
Enter the tag names (tag IDs). These can be cell references or cell IDs of the cells that contains the tag names.
Label
Each tag can be given a label. This is optional.
Axis
Determines which side (Left or Right) the y-axis is displayed.
Test Tag Availability
The Test Tag Availability 
button checks if the entered tag information matches a tag in the select data source
and that the connection to the tag is working and returning data. If the tag is read
correctly, the current value is displayed in a dialog box. Otherwise, the dialog box
displays an error message.
y-Axis (and y-Axis Right) Min, Max
Defines the y-axis minimum and maximum values. When the tag values exceed the configured Min / Max values, these chart peaks are not visible on the chart.
Decimal Points
Determines the number of decimal places for the values on this axis.
Format as Percentage
Select this check box if you want the values to be formatted as percentages.
Sample Points
Determines the number of sample points used for the data range.
Data sources that support more optimal data retrieval than evenly spaced intervals
might not return this exact number of sample points. In this case, the sample points
are used to indicate the density of the data requested.