Raw data file names were read from the REST-service provided table if available. Otherwise, we inspected the "Additional sample data", "Factors" or "Sample ID" sections for information on provided raw files. We attempted to associate deposited spectral raw data with file names in the user-provided metadata by using full paths, base file names, and base file names without extensions. If none of these matched, we also tested whether multiple spectral file names have been deposited as a single value by splitting files via the different separators (",", ";", or " "). Finally, if none of these approaches led to matches, we attempted substring matching between the base file names of the actual spectral raw files and the descriptors provided by uploaders. If unambiguous matches were found, they were accepted. Studies where we could not associate any spectral data to specific samples were discarded.