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. 2016 Feb 22;6:21667. doi: 10.1038/srep21667

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Top three rows are for the same subjects. Top row panels show results for a volunteer on a flat bed with the torso and the head at 30 degrees to the rest of the body. Second from top panels show results for the same volunteer sitting on a chair with the torso and head vertical to the ground (90 degrees). Third from top panels show results for the same volunteer in a supine position. Bottom panel shows results from a different subject on a flat bed with the torso and head at 30 degrees to the rest of the body. The dark stripes indicate the approximate times at which the test was performed.