EasySpin forum

How do we fit a roadmap to data to extract parameters such as gx, gy, gz etc? Attached is an example of the experimental data (symbols) and simulation of a roadmap. Line represents simulation, not a fit to the data.

Use esfit with a custom function, say mysim. This function should call resfields to calculate the resonance fields for all the orientations where you have experimental data. As data for esfit, supply the list of experimental field values.

As a follow-up question, when the spectrum has several overlapping resonances and broad lines, the precise position of each resonance may not be possible to extract.

In such a case, wouldn't it be easier (or rather the only option) to just fit each single-crystal spectrum?

Yes, for spectra with overlapping peaks, fitting the spectra as opposed to peak positions is usually more convenient.