We found that the tangential shear fits both a SIS (solid) and NFW (dashed) profile.  The best fit parameters indicated a cluster mass on the order of 1.5 x 10¹⁵ solar masses.

The image was taken in Chile at CTIO using the Blanco 4-m telescope.  The bottom right panel shows a high mass density (color contrast) at the location of the cluster.  The two circles indicate the region where weak lensing signals were examined.