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The Adaptive Optics Facility (AOF) is an ESO project started in 2005, which transformed Yepun, one of the four 8m telescopes in Paranal, into an adaptive telescope. This has been done by replacing the conventional secondary mirror of Yepun by a 1172 actuator Deformable Secondary Mirror (DSM) and attaching four Laser Guide Star (LGS) Units to its centerpiece, each of them featuring a high stability narrow-band 20 W laser. Additionally, two Adaptive Optics (AO) modules (GALACSI serving MUSE a 3Ddoi:10.34693/coat2019-s3-001 fatcat:4dlxnjtibzch5houcf4da6zeiu