SPACI score report for 3zm4 in ASTRAL 2.04:

PDB Entry: 3zm4
SPACI score: 0.34
AEROSPACI score: 0.34

Experiment type: XRAY
Resolution: 2.37
R-factor: 0.2074
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.688
WCK2 WHAT_CHECK Ramachandran: -0.769
WCK3 WHAT_CHECK Chi angles: -0.914
WCK4 WHAT_CHECK Backbone: 3.467

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).