NoTracking.png
White indicates the addon cannot determine range information for the tracked unit (defaults to your Target).
YellowFar.png
Yellow indicates you're just outside the Halo sweet spot. The Plus indicates you are too far from the watched unit (defaults to the Target)
Green.png
Green indicates you're in the Halo sweet spot.
RedFar.png
Red indicates you're far from the Halo sweet spot. The Plus indicates you are too far from the watched unit (defaults to the Target)
YellowClose.png
Yellow indicates you're just outside the Halo sweet spot. The Minus indicates you are too close to the watched unit (defaults to the Target)
RedClose.png
Red indicates you're far from the Halo sweet spot. The Minus indicates you are too close to the watched unit (defaults to the Target)