stt fit
----------------------------------------------------
   -21.01447,    15.57657,    35.99912,    22.53756,  ! ar
     1.20092,     1.35462,     1.51839,     1.72526,  ! wr
     0.06402,     0.09127,     0.13372,     0.18475,  ! gr
    -0.52381,    14.45075,     5.64175,   -27.51379,  ! b    
     0.56833,                                         ! a
chisq/n:   1.40  

slt fit
----------------------------------------------------
    -4.57502,    10.04528,    11.53974,    10.73916,  ! ar
     1.21052,     1.33719,     1.50151,     1.67875,  ! wr
     0.08612,     0.09206,     0.14029,     0.14515,  ! gr
     0.86694,     0.33788,    -2.56717,    -3.07912,  ! a    
     0.29085,
chisq/n:   1.56