Table 1. Statistics of the Comparison Between Satellite- and Ground-Based Irradiances at Thessaloniki and Ispraa				
Type of Correction	Thessaloniki	Ispra		
	Mean	SD	Mean	SD
CF = 1	19.2	8.9	29.7	16.5
CF = 1 + slope middiot \overline tauabs	5.1	8.1	6.8	13.2
CF = 1 + slope middot tauabs	4.8	6.8	5.6	11.5
CF = intercept + slope middot tauabs	0.0	6.0	-1.4	10.2
aSD, standard deviation. Differences are calculated as percentages, i.e., [(satellite - ground)/ground] x 100%. Results with different corrections for TOMS data are shown; Icorrected = I/CF. Here, slope and intercept are those estimated from linear regressions (examples in Figures 2 and 4), and \overline tauabs is mean tauabs.