SPACI score report for 4e6k in ASTRAL 2.04:

PDB Entry: 4e6k
SPACI score: 0.52
AEROSPACI score: 0.52

Experiment type: XRAY
Resolution: 2
R-factor: 0.154
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.918
WCK2 WHAT_CHECK Ramachandran: -0.659
WCK3 WHAT_CHECK Chi angles: -0.093
WCK4 WHAT_CHECK Backbone: 5.893

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).