cdom_exponential	cdom_exponential
cdom_slope_ratio	cdom_slope_ratio
cdom_spectral_curve	cdom_spectral_curve
coef.exponential_fit	coef.exponential_fit
plot.exponential_fit	plot.exponential_fit
predict.exponential_fit	predict.exponential_fit
spectra	spectra
summary.exponential_fit	summary.exponential_fit
