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Raman spectra of selected fibers found in the rainwater: red fibers (March, September, and December samples); black fibers (December sample), blue fibers (March, August, September, October, November, and December samples) and yellow fibers (September, October, and November samples). Excitation wavelength 647.1 nm, laser power: 100 mW, 50× objective (0.75 NA). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
