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ESO — Reaching New Heights in Astronomy
 
 
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The DIMM seeing is defined as the Full Width Half Maximum of a stellar image observed with a perfect large telescope, at 500nm wavelength and at zenith. It is measured over periods of a few minutes all night long. See the ESO Astroclimatology Overview web pages for more information.
ESO does not routinely extract and store a FWHM measured directly on image pixels.