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They are in length-wise stripes here, not around the circumference of the wire.

Ditto here on all modern cables. When the European green/yellow earth was first adopted here there were some which used a kind of spiral wrap of tracer color, but now they're all longitudinal.

I think the specs call for the proportions to be no greater than 70/30, although I've seen some cheap flexes and cables where it seems to be almost completely yellow with just a very thin green stripe. [Linked Image]

On all of them though, yellow is now the predominant color.