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Published online by Cambridge University Press: 13 May 2016
Using archival HST/WFPC2 optical data and near-infrared VLT/ISAAC spectroscopy, the properties of the Lyman-break galaxy cB58 are analyzed. The z = 0.37 galaxy cluster MS1512+36 lenses it into strongly magnified arcs with ample substructure. The data enables an accurate reconstruction of the source, yielding milliarcseconds resolution; an unparalleled view of the central kpc of the z = 2.72 starburst galaxy.