Image talk:CPGrandensemble.PNG

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I do not know the precise details of "Attribution 2.5", but that looked the nearest to what I got in an email reply that said:

sorry its taken me embarrasingly long to reply to this. This image was in fact generated by Dave Stainforth, and is one we commonly use in talks. I should think its fine to use it, but please attribute climateprediction.net

Given the length of time it took to get that reply, I do not feel like going to try to get another reply from someone more senior and consider that reply good enough.