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  • $\begingroup$ I wouldnt read too much into the modest spread differences. Being concentrations I'd lean toward a gamma GLM with log-link (perhaps GLMM given the replicates but if theyre 'true' replicates it might be unnecessary). That variance function should slightly improve the overall appearance of the spread location plot along the way but isnt primarily why I'd pick that model. $\endgroup$ Commented 2 days ago