SPACI score report for 3zzg in ASTRAL 2.07:

PDB Entry: 3zzg
SPACI score: 0.25
AEROSPACI score: 0.25

Experiment type: XRAY
Resolution: 2.95
R-factor: 0.21357
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.856
WCK2 WHAT_CHECK Ramachandran: -2.135
WCK3 WHAT_CHECK Chi angles: -2.254
WCK4 WHAT_CHECK Backbone: 3.457

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).