Zip file for the target includes experimental data for dihedrals, ambiguous distance restraints, and the sequence. With respect to earlier suggested target N1008 (starting from capital 'N'), now both backbone AND extensive sidechain resonance assignments were used to generate the Ambiguous Contact file, so the false positive rate is very low. There is also a README explaining the data.
The guidelines on the NMR-assisted data can be found at: http://predictioncenter.org/casp13/doc/Montelione-CASP_NMR.pdf and http://predictioncenter.org/casp13/doc/NMR_format_descr.pdf