init para = 81.6834 0.740475 1.3485e-06 0 0.07
PreCalc R0    = 81.6834
PreCalc sigma = 0.740475
PreCalc E0    = 102.313
PreCalc phi   = 1.3485e-06
PreCalc off   = 0
PreCalc kB    = 0.07
original fit results -----------------------------------
Orig Fit R0    = 81.6834
Orig Fit sigma = 0.740475
Orig Fit phi   = 1.3485e-06
Orig Fit off   = 0
Orig Fit kB    = 0.07
Orig  E0       = 102.313
my fit results -----------------------------------
MyF_Min R0 = 73.9406 +/- 0.126576
MyF_Min sigma = 2.1695 +/- 0.139994
MyF_Min phi0 = 6.08815e-07 +/- 1.42988e-08
MyF_Min kb = 0.0730846 +/- 0.0139087
MyF_Min E0    = 96.6283
 Maybe origianl best fit ------------------------------ exmaple
  //fit results
  //R0 = 73.8947
  //sigma = 2.00352
  //phi = 6.12822e-07
  //off = 0
  //kB = 0.0751327
  //E0 = 96.5939