| A simple intruding aeroplane proximity warning. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within the vertical plane only. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within the horizontal plane only. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within both the vertical and horizontal planes. |
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