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Indeed it does that, and thanks for noticing the typo.

I've now just made a small loop where I calculated just the resonance field with resfields and plotted it against the number of points. Here everything looks fine. Where does this shift then come from? And should it be there or is it a bug?

I've noticed a weird shift when comparing a spectrum with small number of points (same as experiment) and one with plenty of points calculated based on fitted parameters. It drove me crazy, thinking I was plotting wrong things, until I've discovered I can easily reproduce it with just calculated spe...