Agilent Technologies 8719D User Manual page 501

If limit lines are on, they are plotted with the data on a plot,
and saved in memory with an instrument state. In a listing of
values from the copy menu with limit lines on, the upper limit
and lower limit are listed together with the pass or fail margin,
as long as other listed data allows sufficient space.
leads to a series of menus used to define limits or specifications
with which to compare a test device. Refer to Limit Lines and
Limit Testing.