Filter information service Reference wavelength. Defined as the same than the pivot wavelength. Reference wavelength. Defined as the same than the pivot wavelength. Mean wavelength. Defined as integ[x*filter(x) dx]/integ[filter(x) dx] Mean wavelength. Defined as integ[x*filter(x) dx]/integ[filter(x) dx] Effective wavelength. Defined as integ[x*filter(x)*vega(x) dx]/integ[filter(x)*vega(x) dx] Effective wavelength. Defined as integ[x*filter(x)*vega(x) dx]/integ[filter(x)*vega(x) dx] Minimum filter wavelength. Defined as the first lambda value with a transmission at least 1% of maximum transmission Minimum filter wavelength. Defined as the first lambda value with a transmission at least 1% of maximum transmission Maximum filter wavelength. Defined as the last lambda value with a transmission at least 1% of maximum transmission Maximum filter wavelength. Defined as the last lambda value with a transmission at least 1% of maximum transmission Effective width. Defined as integ[x*filter(x) dx].\nEquivalent to the horizontal size of a rectangle with height equal to maximum transmission and with the same area that the one covered by the filter transmission curve. Effective width. Defined as integ[x*filter(x) dx].\nEquivalent to the horizontal size of a rectangle with height equal to maximum transmission and with the same area that the one covered by the filter transmission curve. Full width at half maximum. Defined as the difference between the two wavelengths for which filter transmission is half maximum Full width at half maximum. Defined as the difference between the two wavelengths for which filter transmission is half maximum Instrument Observational facility Photometric system