Ignoring standard deviations a = 1.079574 uncertainty: 0.099821 b = -2.006663 uncertainty: 0.017161 chi-squared: 24.047945 goodness-of-fit: 1.000000 Including standard deviations a = 1.079574 uncertainty: 0.100755 b = -2.006663 uncertainty: 0.017321 chi-squared: 96.191780 goodness-of-fit: 0.532773