According to routine FIT the result is:
   a =    1.0031   uncertainty:    0.0202
   b =   -2.0012   uncertainty:    0.0035
   chi-squared:   91.9298  for   100  points
   goodness-of-fit:    0.6536

According to routine MEDFIT the result is:
   a =    1.0082
   b =   -2.0011
   absolute deviation (per data point):   0.0778
   (note: gaussian SPREAD is   0.1000)