In several locations colours are used to indicate the overall vulnerability level for a node. If size permits, a letter is also shown. The following letter and colour combinations are used:
Not yet analysed, no
assessment has been done yet (white)
Ambiguous, the
assessors have conflicting opinions (purple)
Extremely (very)
high, an extreme risk (bright red)
High (red)
Medium
(yellow-orange)
Low
(green-orange)
Unknown, because of lack of
knowledge (sky blue).
Extremely (ultra)
low, the risk level is negligible or absent (bright green)