text =
linear model
chsqval =
  881.5368
bfit =
   -7.0066   10.2090
covar =
    0.0334   -0.0121
   -0.0121    0.0044
stderrs =
    0.1828
    0.0664
text =
parabolic model
chsqval =
   35.4414
bfit =
    3.2421    2.3368
covar =
    0.0132   -0.0017
   -0.0017    0.0002
stderrs =
    0.1147
    0.0149
text =
quadratic model
chsqval =
   10.9252
bfit =
    1.6304    1.4983    2.0081
covar =
    0.1191   -0.0985    0.0199
   -0.0985    0.0916   -0.0201
    0.0199   -0.0201    0.0046
stderrs =
    0.3451
    0.3026
    0.0681
text =
exponential model
chsqval =
  104.3138
bfit =
    3.6109    0.6374
covar =
    0.0045   -0.0004
   -0.0004    0.0000
stderrs =
    0.0667
    0.0060
