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The IFAS7 school will bring together students from different horizons, expose them to high-level specialized lectures, and propose them to carry-on a eigh-days research project. The title of the present school is spectroscopy, treasures in the voxels. The voxels and the spaxels, are the elements that compose the data-cubes of integral-field spectroscopy. The topics will go from the observational and data-reduction techniques, through the source detection and extraction in integral-field spectroscopy using inverse methods data fusion approaches, to data analysis. The school is open to students at doctoral and post-doctoral levels, and to highly skilled and motivated master students, without geographic restrictions. IFAS7 is the seventh edition of a series co-organized by Lyon (LIO, CRAL CNRS UMR5574, UCBL1) and IUCAA in Pune. The first, third and fifth editions were held in 2015, 2017, and 2019 in Pune on observational astronomy, and the other in Lyon. In 2016 on modeling and simulations in astrophysics, and in 2018 and 2020 on 3D spectroscopy. These schools hosted participants from fourteen different nationalities. The Centre de Recherche Astrophysique de Lyon (CRAL) has been a pioneer or 3D, or Intergral field spectroscopy, and recently assembled the MUSE spectrograph now in operation at the ESO-s VLT. This is one of the largest and most advanced IFU spectrograph, and it opened the era of spectroscopic blind surveys, where, rather than targeting pre-selected sources, entire new classes of objects can be discovered out of deep fields. IUCAA is coordinating major efforts to develop theoretical and observational astronomy in India, including spatial astronomy, international projects, like the TMT, and gravitational waves, LIGO-India. IFAS7 will give introduction and practical experience on the cutting-edge spectroscopic methods. I Lectures will be given during the morning sessions, and research projects will be proposed to the participants, in small groups supported by a tutor. The school will be concluded by a presentation of the results of these projects. Up to 30 participants will be selected. The organizers may provide partial financial support on demand and justification (this may take the form of reduced registration fees and/or travel grants).