Hi all,

I am experiencing an issue with CN and sigma2, which are correlated. My CN
value is too high, and I would like to reduce it to see if I can improve
the fit.

I have three questions:

   1. Are constraints a viable option? If not, could you clarify the
   alternatives?
   2. The examples I found are in Python, but I am using the GUI. How
   should I correctly define a constraint? GPT suggested the following:
   max(4, 12 * exp(-sigma2_O232 / 0.02)), is it correct?
   3. I attempted to apply this constraint, but now I cannot delete it.
   Restarting Larch for each value is not a practical solution. How can I
   modidy the constraint efficiently?

Thank you for your help!

Best regards,
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