The Cherenkov Telescope Array (CTA) is the next generation of Imaging Atmospheric Cherenkov Telescopes. It will reach a sensitivity and an energy resolution with no precedent in very high energy gamma-ray astronomy. In order to achieve this goal, the systematic uncertainties derived from the atmospheric conditions shall be reduced to a minimum. Different instruments may help to understand and account for the precise state of the atmosphere at a given time. The Barcelona IFAE/UAB (acronyms for
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