The F160W filter was used, which has a peak wavelength of 1.583 m and a FWHM of 0.40 m, and corresponds approximately to the standard infrared H-band. All observations were calibrated by the standard STScI pipeline procedure involving bias and dark current subtraction, linearity and flat-field correction, photometric calibration and cosmic ray identification and removal. This allows good cosmic ray detection and removal. Only one, quite complex, object is visible in the 11-arcsecond field of view. This object consists of a central condensation, surrounded by a ring of diameter 095.
More extended fuzz is also visible out to a radius of .
We identify the central condensation as the centre of the lensing galaxy, and the extended fuzz as its outer regions. The lensed object is extended in the optical, and some part of it is lensed into the ring structure that we see in the HST picture. We present and discuss more detailed models of the system below. The total H magnitude of all components visible is measured as 18.0 0.3, with an error dominated by the relatively bright and variable background. Because of the rough agreement with the H magnitude obtained by Rhoads et al.