Thermo Scientific Apreo User's Operation Manual page 157

Custom Annular 1 / 2 / 3 / 4
These buttons uses separate variations of segments adjustable
by clicking any segment:
• Click on the Custom Annular 1 / 2 / 3 / 4 radio button.
+ sign – segment signal is added (yellow color)
– sign – segment signal is subtracted (blue color)
no segment signal (gray color)
The combination set remains stored under the particular user.
Custom Angular
• Click on the Custom Angular radio button.
You can select / deselect any combination of outer segment
partitions by clicking on them in the detector diagram. Selected
segments are highlighted in yellow.
The entire area of the selected segments can be "rotated" using
the circle arrow buttons to view orientation contrast changes.
C O N F I D E N T I A L – limited rights
Revision A Feb 2018
System Options: Optional Detectors
User Manual 7-11