http://www.humanconnectomeproject.org/data/inventory/ http://www.humanconnectomeproject.org/data/inventory/ If I'm reading it correctly, it looks like either 1

http://www.humanconnectomeproject.org/data/inventory/ http://www.humanconnectomeproject.org/data/inventory/ If I'm reading it correctly, it looks like either 1.5mm, 2mm, or 2.5mm, depending on the dataset.