MTS Multipurpose Elite - Manual (Page 570)

Vertical limit type
When you select the Vertical limit type, the X Variable specifies the value where the limit line crosses the
X axis, as shown in the following figure.
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
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