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The long exposure times of the HST Ultra-Deep Field plus the use of anempirically derived position-dependent PSF, have enabled us to measure acardioid/displacement distortion map coefficient as well as improving upon thesextupole map coefficient. We confirmed that curved background galaxies areclumped on the same angular scale as found in the HST Deep Field North. The newcardioid/displacement map coefficient is strongly correlated to a product ofthe sextupole and quadrupole coefficients. One would expect to see such acorrelation from fits to background galaxies with quadrupole and sextupolemoments. Events that depart from this correlation are expected to arise frommap coefficient changes due to lensing, and several galaxy subsets selectedusing this criteria are indeed clumped.Comment: 9 pages, 16 figures, submitted to ApJ letter

Lensing Signals in the Hubble Ultra Deep Field Using All Second‐Order Shape Deformations