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3.3 User objects Multiple models UOM 1 UOM 2 HEFA user – direct users that perform measurements. Other staff – 'viewers'. User Objects Source User Object Attributes Users Measurement number of scans wavelength range (from, to, step) Context (measurement information) date time from time to sample sample OD sample temperature monochromator slit widhts Configuration ADC number of samples ADC sampling rate, filter set crossover wavelength filter set peak transmittance wavelength data directory Reference signal Sample signal Absorbance signal Data file Context file Task models — — Data model — — HEFA 15 March 2006 7
