Confidence level of the fit

If the `\CL` qualifier is used, a new scalar, named `FIT$CL` , will be made with value equal to the confidence level:

where n is the degrees of freedom, usually equal to the number of data points minus the number of parameters, (N-M). The confidence level is the probability that a random repeat of the given experiment would observe a worse `&chi2`, assuming the correctness of the model.

Correlation and covariance
Number of iterations