The format of the data is as follows: ST - WMO Staion # (316 - de Bilt, NL close to Bolthoven ) # - Instrument # (133 for instrument in Bilthoven) year - Year number m - month d - day of month N - number of spectra per averaging interval 3040nm - spectral surface irradiance at 304nm [Wm-2] 3045nm - spectral surface irradiance at 304.5nm [Wm-2] 3050nm - spectral surface irradiance at 305nm [Wm-2] 3055nm - spectral surface irradiance at 305.5nm [Wm-2] 3060nm - spectral surface irradiance at 306nm [Wm-2] 3090nm - spectral surface irradiance at 309nm [Wm-2] 3095nm - spectral surface irradiance at 309.5nm [Wm-2] 3100nm - spectral surface irradiance at 310nm [Wm-2] 3105nm - spectral surface irradiance at 310.5nm [Wm-2] 3110nm - spectral surface irradiance at 311nm [Wm-2] 3230nm - spectral surface irradiance at 323nm [Wm-2] 3235nm - spectral surface irradiance at 323.5nm [Wm-2] 3240nm - spectral surface irradiance at 324nm [Wm-2] 3245nm - spectral surface irradiance at 324.5nm [Wm-2] 3250nm - spectral surface irradiance at 325nm [Wm-2] 3490nm - spectral surface irradiance at 323nm [Wm-2] 3495nm - spectral surface irradiance at 323.5nm [Wm-2] 3500nm - spectral surface irradiance at 324nm [Wm-2] 3505nm - spectral surface irradiance at 324.5nm [Wm-2] 3510nm - spectral surface irradiance at 325nm [Wm-2] 3700nm - spectral surface irradiance at 370nm [Wm-2] 3705nm - spectral surface irradiance at 370.5nm [Wm-2] 3800nm - spectral surface irradiance at 380nm [Wm-2] 3805nm - spectral surface irradiance at 380.5nm [Wm-2] 3900nm - spectral surface irradiance at 390nm [Wm-2] int CIE - integrated Erythemal irradiance [mWm-2] dail CIE- DAILY INTERGRATED ERYTHEMA [mWm-2] N - number of spectra per DAILY INTERVAL minZA - min SZA of Brewer measurements minZAx - minx SZA of Brewer measurements minZA - mean SZA of Brewer measurements snow - measured snow depth [cm] (if available) All values are simple AVERAGES for all measurements taken between 11:00 and 12:59 SOLAR time The units are Wm-2 for spectral fluxes and mWm-2 for int CIE (the CIE values are between 0 and 300). Example: ST # year m d N w3040 w3045 w3050 w3055 w3060 w3090 w3095 w3100 w3105 w3110 316 nlr 1996 1 31 10 4.45126E-04 6.95427E-04 1.17751E-03 1.341009E-03 1.375477E-03 4.970476E-03 6.722829E-03 6.907272E-03 1.146197E-02 1.463474E-02 w3230 w3235 w3240 w3245 w3250 6.466618E-02 8.083653E-02 9.459661E-02 9.413336E-02 8.360547E-02 w3490 w3495 w3500 w3505 w3510 .1528355 .1534528 .187718 .1992845 .1781004 w3790 w3795 w3800 w3805 w3810 int CIE daily CIE Nday minZA maxZA meanZA snow .2295159 .2098362 .2219981 .2672031 .2667732 19.43452 35 -999 69.63 70.65 70.024 -1