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Peter, the reason I think it is an average rather than a sum is because if I change the WDM exposure length, the size/saturation of the star changes accordingly, i.e. shorter camera exposures yield a lower FWHM and visually smaller stars. I wouldn't have expected that if it were a summed stack. But I could be wrong...
I was also, I admit, thinking of Metaguide, which very explicitly seeks to characterize the centroid via averaging, rather than modelling based on an assumed star shape/light spread distribution function.
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