MTS Multipurpose Elite - Manual (Page 552)

General XY (Single Value or Array)
The General XY limit type allows you to select a single value variable or an array variable. You can use it
to plot complex limits that are not linear, such as polynomial. By default, selecting the General XY creates
a chart with a line without symbols. A line with a single value will show up as a point, as in the following
figure. This differs from Traces, where a single value will show nothing.
Indexed Values limit type
When you select Indexed Values, the values at the selected Index Variables are plotted on the chart.
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