1. Fluorescence data were measured on an Horiba AquaLog
- Fluorescence was measured as signal/reference beam.
- Internal excitation- and emission-correction factors were applied
- Blanks (ultrapure water) with identical instrument settings were subtracted
2. Inner filter effects were eliminated with the absorbance-based method 
3. Fluorescence signals were normalized using the Raman peak area of ultrapure water at 350nm.
4. First-order Rayleigh scatter bands were removed and replaced with missing numbers and Raman scatter bands and the second-order Rayleigh scatter band were replaced with interpolated data. 
5. Fluorescence emission wavelengths were restricted to the range 300-620 nm, and excitation was restricted to the range 250-452 nm.


About the data
1. Each *.csv file contains the wavelength information in nm as column and row headers (columns=excitation, row=emission) and the fluorescence observations processed as described above.
2. Each file is named with its sample identifier.
3. The file "metadata_std.csv" contains information on the sample type and all other useful information for the description of the samples detailed in the main text.
4. The zip-file contains  *.mat (MATLAB) files that hold data equivalent to the csv-files in a format that is compatible to the drEEM toolbox (dreem.openfluor.org)
5. The *.ods (OpenDocument Spreadsheet) file contains spreadsheets with scores and loadings of the standards (CIP, NAP and ZOL) PARAFAC model.
6. For information on the component number, please refer to the file "metadata_std.csv", column: Comp_PARAFACmodel.

