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Absorption spectra of the OFs (A) and CFs (B) of AsTh1 (a), SyTh1 (b), AsTh2 (c), SyTh2 (d), AsOTh1 (e), SyOTh1 (f), AsOTh2 (g), and SyOTh2 (h). The absorption of the OFs in (A) above 460 nm is due to the presence of low amounts of the corresponding CFs (formed during manipulation of the solids and/or preparation of the solutions).
