Hello ROOTers ! I have following data set and I would like to fit these values using gaussian function. I could fit. But the sigma of result of fit is peculiar. It's value is minus. Why the sigma is minus ? Is it ordinary behevior of fitting ? I attached ps file of result of fit. In the graph, p0 -> constant, p1->mean, p2->sigma. ------ data set --------- -4.875000 11.2877 19.2555 -4.625000 -1.51158 19.483 -4.375000 28.0305 19.1328 -4.125000 16.8634 19.4476 -3.875000 -6.06664 19.6773 -3.625000 17.5673 19.3519 -3.375000 18.0013 19.2891 -3.125000 0.0122975 19.2632 -2.875000 -8.8495 19.2595 -2.625000 -2.269 19.2171 -2.375000 -1.83825 19.154 -2.125000 -18.7014 19.1244 -1.875000 13.1121 19.0246 -1.625000 2.73537 19.6297 -1.375000 -14.1883 19.448 -1.125000 4.21429 19.2307 -0.875000 -26.4092 19.1161 -0.625000 -37.6974 19.2017 -0.375000 -85.1394 19.0828 -0.125000 -123.675 19.1227 0.125000 -97.6141 19.5093 0.375000 -61.8173 19.2825 0.625000 -12.6419 19.5097 0.875000 -22.5329 19.3263 1.125000 -6.85978 19.3608 1.375000 3.64534 19.7056 1.625000 17.0031 19.2862 1.875000 -14.6644 19.535 2.125000 -20.5573 18.9344 2.375000 5.01405 19.1549 2.625000 1.62057 19.3475 2.875000 -18.1711 19.2898 3.125000 -5.51773 19.3767 3.375000 1.84787 19.3669 3.625000 -8.84978 19.2802 3.875000 -5.60688 19.3258 4.125000 -13.3567 19.3979 4.375000 -8.71397 19.0163 4.625000 -25.7126 19.6368 4.875000 2.9404 19.0503
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