2,DATETIME,DATETIME,MJD2K,DOUBLE,Time of the measurement; defined relative to reference datetime of Jan. 1 2000 at 0:00:00 UT which is equal to 0.00,x
2,WAVELENGTH,WAVELENGTH,nm,REAL,Instrument exact wavelengths,x
2,ALTITUDE.INSTRUMENT,CONSTANT,m,REAL,Inst. geolocation. Altitude of the instrument relative to the location site,x
2,LATITUDE.INSTRUMENT,CONSTANT,deg,REAL,Inst. geolocation. Latitude north (decimal degrees) of the location of the instrument (+ for north; - for south),x
2,LONGITUDE.INSTRUMENT,CONSTANT,deg,REAL,Inst. geolocation. Longitude east (decimal degrees) of the location of the instrument (+ for east; - for west),x
2,INTERNAL.INSTRUMENT.TEMPERATURE,DATETIME,degC,REAL,Internal temperature sensor,x
2,ANGLE.SOLAR_ZENITH.ASTRONOMICAL,DATETIME,deg,REAL,The solar astronomical zenith angle at which the measurement was taken,x
2,AIR.MASS,DATETIME,1,REAL,Optical air mass,x
2,AEROSOL.OPTICAL.DEPTH,DATETIME;WAVELENGTH,1,REAL,Aerosol optical depth at corrisponding wavelength,x
2,H2O.COLUMN_ABSORPTION.SOLAR,DATETIME,cm,REAL,Total column water vapor at 940 nm,o
2,AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.INDEX,AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.INDEX,1,BYTE,Index of number of wavelength pairs considered for the AEROSOL.ANGSTROM.EXPONENT calculation,x
2,AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.PAIR,AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.INDEX;INDEPENDENT,nm,REAL,Boundaries of the range of wavelengths used for the calculation of AEROSOL.ANGSTROM.EXPONENT. The algorithm uses all wavelengths listed in WAVELENGTH variable, comprised in this range,x
2,AEROSOL.ANGSTROM.EXPONENT,DATETIME;AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.INDEX,1,REAL,Aerosol Angstrom exponent retrieved using the wavelengths range specified by the variable AEROSOL.ANGSTROM.EXPONENT_WAVELENGTH.PAIR,x
2,SOURCE.PRODUCT,INDEPENDENT,[empty],STRING,Information relevant to the source history of the Metadata and Data,o