SPACI score report for 1t6y in ASTRAL 2.07:

PDB Entry: 1t6y
SPACI score: 0.23
AEROSPACI score: 0.23

Experiment type: XRAY
Resolution: 2.8
R-factor: 0.231
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.527
WCK2 WHAT_CHECK Ramachandran: -4.759
WCK3 WHAT_CHECK Chi angles: -4.23
WCK4 WHAT_CHECK Backbone: -0.381

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).