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Factors Kabs (a), Ksca (b), and Kext (c) for laser radiation with wavelengths 532 (solid line) and 800 nm (short dashed line) and water core–gold shell spherical nanoparticles for the range of radii r0 = 5–100 nm and thicknesses of shell Δr0 = 10 (1), 20 (2), and 40 (3) in water