Eyjafjallajökull vent system diagram

I've been wondering if Katla and Eyjafjallajökull were on the same volcanic vent system, but this graphic from the Institute of Earth Sciences, University of Iceland web site tells a different story. I saw this diagram over a week ago, lost the link, and couldn't find the page anywhere as I set my browser to purge its viewing history every time I close it.

Makes for enlightening viewing. Click on graphic to see the full size image