I honestly don't understand what you are talking about. This map shows the Celtic Y-DNA distribution throughout Europe. There is a grey area in the northern Netherlands, north-western Germany and western Denmark. This is because of a high percentage of Germanic Y-DNA that overwhelms the region...
I think you're looking at the wrong map, chap. This is the Italo-Celtic Y-DNA distribution map, the one that shows Germanic Y-DNA has >75% Germanic Y-DNA in the areas you've just stated. I would link you but I haven't made enough posts yet to post links.
What is the reason for the higher percentage of Germanic Y-DNA in north-western Sicily? Possibly the Normans or some completely unrelated migrations pre Germanic culture?
Another great map. Is there a reason why there is a drop in percentage around northern central France? After looking at the Germanic map it doesn't appear that a higher percentage of Germanic Y-DNA is the cause.
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