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X-ray and optical observations of quadruply lensed quasars can provide amicroarcsecond probe of the lensed quasar, corresponding to scale sizes of\~10^2-10^4 gravitational radii of the central black hole. This high angularresolution is achieved by taking advantage of microlensing by stars in thelensing galaxy. In this paper we utilize X-ray observations of ten lensedquasars recorded with the Chandra X-ray Observatory as well as correspondingoptical data obtained with either the Hubble Space Telescope or ground-basedoptical telescopes. These are analyzed in a systematic and uniform way withemphasis on the flux-ratio anomalies that are found relative to the predictionsof smooth lens models. A comparison of the flux ratio anomalies between theX-ray and optical bands allows us to conclude that the optical emission regionsof the lensed quasars are typically larger than expected from basic thin diskmodels by factors of ~3-30.Comment: 11 pages, accepted to ApJ, expanded discussion of the analysis of the  flux ratios and how they constrain the quasar emission region

X‐Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars. I. Zooming in on Quasar Emission Regions