SPACI score report for 1k6k in ASTRAL 1.75:

PDB Entry: 1k6k
SPACI score: 0.58
AEROSPACI score: 0.58

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.214
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -1.421
WCK2 WHAT_CHECK Ramachandran: -0.196
WCK3 WHAT_CHECK Chi angles: -1.23
WCK4 WHAT_CHECK Backbone: 0.53

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).