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Linear absorption spectrum of silk gel with background subtracted. The vertical line at 810 nm indicates the wavelength used for multiphoton micromachining. Pump/2 and Pump/3 lines indicate the wavelengths associated with a two-photon and three-photon absorption process, respectively. Linear absorption is driven by tyrosine and tryptophan residues in the silk. Spectrum was filtered by a five-point moving average to reduce noise.
