Table 1.

Excitation and emission maxima of PARAFAC components and their relation to conventional peaks as described by Coble et al. (2014).

PARAFAC Component	Excitation/Emission Maxima (nm/nm)	Corresponding Conventional Peak(s)	Corresponding Component(s) from the FCE Model	Description
C1	<260(ex)/425(em), 310(ex)/425(em)	AC/C	FCE1, FCE3	Ubiquitous humic-like Terrestrial humic-like
C2	260(ex)/>500(em), 370(ex)/>500(em)	AC+/C+	FCE1, FCE5	Ubiquitous humic-like Terrestrial humic-like
C3	<260(ex)/375(em), 300(ex)/375(em)	AM/M	FCE4, FCE6	Microbial humic-like
C4	275(ex)/320(em)	B/T	FCE7	Protein-like

Components from the FCE PARAFAC model (Chen et al., 2010), which were statistically related to C1–C4 at the 90% confidence level, and their descriptions (from Yamashita et al., 2010) are also listed.