SPACI score report for 4k6d in ASTRAL 2.07:

PDB Entry: 4k6d
SPACI score: 0.57
AEROSPACI score: 0.57

Experiment type: XRAY
Resolution: 1.65
R-factor: 0.191
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.799
WCK2 WHAT_CHECK Ramachandran: -0.304
WCK3 WHAT_CHECK Chi angles: 1.283
WCK4 WHAT_CHECK Backbone: 2.693

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).