SPACI score report for 3zmg in ASTRAL 2.03:

PDB Entry: 3zmg
SPACI score: 0.54
AEROSPACI score: 0.54

Experiment type: XRAY
Resolution: 1.74
R-factor: 0.17678
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.574
WCK2 WHAT_CHECK Ramachandran: -1.237
WCK3 WHAT_CHECK Chi angles: 0.272
WCK4 WHAT_CHECK Backbone: 1.499

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).