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Excitation intensity spectra measured by recording the emission intensity at 630 nm of 7 g/l rhodamine B in ethylene glycol with 405, 436, 470 and 510 nm excitation, respectively. (a) Excitation intensity spectra (normalized to the maximum excitation intensity) measured under three attenuation degrees (Transmission: T = 0.25%, 0.5% and 1%). (b) Normalized excitation intensity spectra measured from 16 December to 20 December under T = 0.25%.
