Teledyne LeCroy LabMaster 10Zi Getting Started Manual - Manual (Page 97)

LabMaster 10 Zi Oscilloscopes
90 LM10Zi-GSM-E Rev A

Eye Diagram - Flat group delay compensation resulting in
equalized preshoot and overshoot. This selection improves the
symmetry of serial eye diagrams. In addition, a fourth-order
Bessel frequency response is implemented.

Flatness - Flat group delay compensation with a brick-wall
frequency response. While this provides the fastest rise time,
there is also a slight penalty of more preshoot and overshoot
compared to Eye Diagram mode. This selection is most often
used in narrow-band RF measurements where it is desired to
maintain constant magnitude response over the oscilloscope
passband.