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. 2012 Dec 23;54(3):494–514. doi: 10.1093/jrr/rrs114

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© The Author 2012. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Therapeutic Radiology and Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3. — Photon linear-quadratic parameters of the cell lines of the experiments included in the PIDE plotted against each other. Higher values of β occur for small values of α only. The straight line emerges from a linear fit to the data points.