cand_id =        0, my chi2 =       7.85000 , ben chi2 =       7.84585, difference =    0.00415087
cand_id =        1, my chi2 =       8.95000 , ben chi2 =       8.94637, difference =    0.00363350
cand_id =        2, my chi2 =       9.05000 , ben chi2 =       9.05033, difference =  -0.000327110
cand_id =        3, my chi2 =       12.3600 , ben chi2 =       12.3587, difference =    0.00132465
cand_id =        4, my chi2 =       13.3800 , ben chi2 =       13.3814, difference =   -0.00142384
cand_id =        5, my chi2 =       13.6400 , ben chi2 =       13.6486, difference =   -0.00859070
cand_id =        6, my chi2 =       13.7800 , ben chi2 =       13.7753, difference =    0.00465012
cand_id =        7, my chi2 =       13.9500 , ben chi2 =       13.9377, difference =     0.0123014
cand_id =        8, my chi2 =       17.5700 , ben chi2 =       17.5729, difference =   -0.00288582
cand_id =        9, my chi2 =       19.0100 , ben chi2 =       19.0080, difference =    0.00204659
cand_id =       10, my chi2 =       19.3800 , ben chi2 =       19.3701, difference =    0.00993538
cand_id =       11, my chi2 =       19.8400 , ben chi2 =       19.8461, difference =   -0.00613022