GCC-001 - Gaia
Summary: When building a large set of ground based Spectro-Photometric Standard Stars (SPSS) for calibrating Gaia BP/RP spectra and G-band images to a few percent in absolute flux, it is essential to maintain the maximum homogeneity in data quality, acquisition and treatment. The procedure followed to pre-reduce the data, extract 1D spectra and perform the wavelength calibration is here described step by step. This procedure can be applied to any telescope, with a few exceptions: special "tips" are discussed for the CAFOS@CAHA2.2 and DOLoReS@TNG instruments in the Appendices.
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