In the WFM700M+ why is there a difference in jitter measurements between line and field sweep when in line select while the jitter measurements are the same without line select?

In the WFM700M+ why is there a difference in jitter measurements between line and field sweep when in line select while the jitter measurements are the same without line select?

When line select is off the jitter measurement readout reflects the maximum amount of jitter in full field. This is true for both Line and Field Sweeps. When line select is turned on and Line Sweep is selected, the jitter measurement readout displays "line n jitter" with n being the selected line number. This readout indicates that the jitter measurement is for the selected line only. Line Select is automatically disabled for Field Sweep. The jitter measurement on an individual line will always be equal to or less than the full field jitter measurement.