SPACI score report for 3k4f in ASTRAL 2.06:

PDB Entry: 3k4f
SPACI score: 0.38
AEROSPACI score: 0.38

Experiment type: XRAY
Resolution: 2.17
R-factor: 0.225
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.097
WCK2 WHAT_CHECK Ramachandran: -0.375
WCK3 WHAT_CHECK Chi angles: -0.841
WCK4 WHAT_CHECK Backbone: 0.76

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).