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Characterization of the fibre (A), standard hand-piece (B) and the novel flat-top hand-piece prototype; (C) beam profile through a camera Spiricon SP928 equipped with the software BeamGage Professional. Setting the instrument for an irradiation with 1 W the main colours displayed are: purple = 0.1 W/cm2; fuchsia = 0.3 W/cm2; blue = 0.6 W/cm2; light blue = 0.9 W/cm2; green = 1 W/cm2; yellow = 1.6 W/cm2; orange = 2.0 W/cm2; red = 2.2 W/cm2.
