Local convergence ratios and reduced shears for B0128+437, derived model-independently at image and subcomponent scales, indicate that elliptical lens models are too simple for this system when milliarcsecond substructure is included.
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Model-independent and model-based local lensing properties of B0128+437 from resolved quasar images
Local convergence ratios and reduced shears for B0128+437, derived model-independently at image and subcomponent scales, indicate that elliptical lens models are too simple for this system when milliarcsecond substructure is included.