SPACI score report for 1z4m in ASTRAL 2.08:

PDB Entry: 1z4m
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.7
R-factor: 0.194
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.513
WCK2 WHAT_CHECK Ramachandran: 0.16
WCK3 WHAT_CHECK Chi angles: 0.519
WCK4 WHAT_CHECK Backbone: 3.328

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).