SPACI score report for 1t6k in ASTRAL 2.08:

PDB Entry: 1t6k
SPACI score: 0.5
AEROSPACI score: 0.5

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.188
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.99
WCK2 WHAT_CHECK Ramachandran: 0.575
WCK3 WHAT_CHECK Chi angles: -0.456
WCK4 WHAT_CHECK Backbone: 0.779

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).