Definition(en): File generated by The Spectral Geologist (TSG), processing software designed for the analysis of field or laboratory spectrometer data. TSG stores the spectral and associated data (geochemistry, coordinate data etc) in two files, regardless of the number of spectra in the dataset. These files have the extensions .bip and .tsg. The .bip file stores all of the spectral and associated data; it is usually far larger than the .TSG file. The .tsg file stores a description of the data contained in the associated .BIP file. Both files are essential for TSG to be able to access the dataset and must be together in the same directory.