Chi2fit.Utilities.puts_errors

You're seeing just the function puts_errors, go back to Chi2fit.Utilities module for more information.
Link to this function

puts_errors(device \\ :stdio, errors)

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Specs

puts_errors(device :: IO.device(), errors :: tuple()) :: none()

Outputs and formats the errors that result from a call to Chi2fit.Fit.chi2/4

Errors are tuples of length 2 and larger: {[min1,max1], [min2,max2], ...}.