Excessive external shear in ellipsoidal lens models of quadruply-lensed quasar NLRs always resolves position anomalies and reduces flux-ratio anomalies, concealing signals commonly attributed to dark-matter substructure.
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The Subversive Role of Excessive External Shear in Concealing Lensing Anomalies
Excessive external shear in ellipsoidal lens models of quadruply-lensed quasar NLRs always resolves position anomalies and reduces flux-ratio anomalies, concealing signals commonly attributed to dark-matter substructure.