144    WM-OM-E Rev I 
5.  Touch the "Phistogram" tab, then touch inside the Slice Direction field and select 
Horizontal or Vertical slice from the pop-up menu. 
6. Touch inside the Slice Center field and enter a value, using the pop-up keypad. 
7. Touch inside the Slice Width field and enter a value, using the pop-up keypad. 
Note: You can use the front panel Adjust knobs to move the Slice Center line and the Slice Width boundary lines. 
Persistence Trace Range 
This math operation has a field where you can enter the percent of the persistence trace population 
to use in creating a new waveform. 
Persistence Sigma 
This math operation has a field where you can enter a scale, measured in standard deviations, by 
which to create a new waveform.