Hi all, I did a multiple shell fit for platinum foil and the results were similar: S02 = 0.51 and the uncertainty varies from 0.02 to 0.03 depending on the fit. Please find enclosed a file with values of energy, I0 and I of the platinum foil. I include this file if someone has curiosity on raw data and has time, otherwise forget it. Maybe I can suppose a value of 0.85 for S02 and follow with the analysis of the data, then...CN equation proposed in the first e-mail is ok? Thank you very much Best regards, JA 11297.93828 2878 372358 11306.20956 2906 372292 11314.43751 2914 372058 11322.95624 2928 371952 11331.26478 2944 371682 11339.80927 2960 371614 11348.08699 2992 371372 11356.65728 3006 371244 11365.01615 3044 371104 11373.66867 3082 370976 11381.94038 3120 370776 11390.5627 3152 370662 11399.02884 3190 370420 11407.73406 3218 370214 11415.99953 3270 370056 11424.61761 3328 369524 11433.13526 3366 368060 11441.89347 3444 367558 11450.2663 3570 368788 11458.87993 3644 363456 11467.62108 10656 1026572 11468.65034 10738 1030714 11469.27942 11064 1052010 11469.96578 11292 1071180 11470.76663 11450 1079322 11471.45316 11466 1080080 11472.08256 11502 1078352 11472.76926 11576 1081712 11473.51327 11638 1082000 11474.31463 11626 1079298 11475.00159 11692 1078474 11475.80316 11694 1073826 11476.54757 11730 1076298 11477.17754 11728 1072708 11477.92213 11640 1061240 11478.49496 11654 1054028 11479.23973 11748 1055294 11480.0419 11720 1047422 11480.67225 11572 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