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If I have n data points (xi, yi) each with error bars in both x and y (xi_err, yi_err), should I use 1/(xi_err^2+yi_err^2) as theweightin a weighted least squares linear fit, or should the weight be a different value that has nothing to do with error bars? I've never used WLS fitting and I'll appreciate your help!

Many thanks,

-Lav

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# Weighted least squares fitting

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