quetion about s13 wiring diagram

[captainismo]

hey guys n gals, can you tell me what the dashed lines surrounding certain wires on my 1993 nissan 240sx eccs wiring diagram mean? one wire for example is the white wire for the knock sensor going to terminal # 27 on the engine wiring harness. there are also circles at the end of the dashed lines indicating one or more wires its been tracing...