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Surface parameters of irradiated PHEMA layers for 2 μm × 2 μm scan areas: (a) mean Z-height; (b) area roughness (Ra); (c) area RMS; (d) maximum range. The surface parameters keep getting larger up to ~100 lp, followed by values reduction up to 200 lp. Then, they remain constant for photon fluence higher than 50 kJm−2.
