{center}[!ScanImage Pics^r3_5_MotorGUI.png|height=150!|ScanImage Pics^r3_5_MotorGUI.png]{center}
h6. New Controls
Some new controls have been added to the Motor Controls to facilitate stack collection:
* *Stack Start/End*: These read-only display controls allow Z positions set via _start_ and _end_ buttons to be seen, and stored even as the current Z position may be updated.
* *Slice Params Obey Start/End*: If selected, when either one of the _# slices_ or _Z step/slice_ is adjusted in the {link-window:ScanImage Pics^r3_5_StandardModeGUI.pngPics|popup=true}*Standard Mode Controls*{link-window} window, the other parameter will auto-adjust, so the start/endpoints set here remain in effect. For example, the user can vary the _Z step/slice_ and the _# slices_ will auto-adjust based on the distance between the stack start/end. If the checkbox is deselected, any change to the _Z step/slice_ or _# slices_ will clear the stack start/endpoints.
h6. Modified Controls
* *GRAB*: This control, which initiates a GRAB acquisition consisting of a Z stack between the displayed stack start/endpoints, is now inactive unless both a stack start and end have been entered.
