SPACI score report for 3ez4 in ASTRAL 2.04:

PDB Entry: 3ez4
SPACI score: 0.4
AEROSPACI score: 0.4

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.197
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.193
WCK2 WHAT_CHECK Ramachandran: -0.125
WCK3 WHAT_CHECK Chi angles: -1.981
WCK4 WHAT_CHECK Backbone: 0.438

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).