Use this command to manually adjust the scaling of the loaded histogram data.
A rectangle encompassing the data is displayed. Sizing handles appear on the edges of the rectangle. Position the mouse over a sizing handle, click and hold the button down, and drag to position a new boundary.
Data below the left boundary and above the right boundary will be excluded from the analysis. Adjusting the top of the scaling rectangle re-scales the data on the Y-axis graphically, but has no effect on the analysis.
Normally when each new data file is opened, the program will automatically scale the data. See the section on the Options and Configuration dialog box to learn how to disable the auto-scaling feature.