SPACI score report for 1t6j in ASTRAL 1.71:

PDB Entry: 1t6j
SPACI score: 0.34
AEROSPACI score: 0.34

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.243
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.699
WCK2 WHAT_CHECK Ramachandran: -2.685
WCK3 WHAT_CHECK Chi angles: -1.836
WCK4 WHAT_CHECK Backbone: -4.521

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).