SPACI score report for 4k0r in ASTRAL 2.05:

PDB Entry: 4k0r
SPACI score: 0.28
AEROSPACI score: 0.28

Experiment type: XRAY
Resolution: 2.65
R-factor: 0.194
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.554
WCK2 WHAT_CHECK Ramachandran: -3.271
WCK3 WHAT_CHECK Chi angles: -3.105
WCK4 WHAT_CHECK Backbone: 2.504

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).