SPACI score report for 1z8g in ASTRAL 2.07:

PDB Entry: 1z8g
SPACI score: 0.59
AEROSPACI score: 0.59

Experiment type: XRAY
Resolution: 1.55
R-factor: 0.196
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.075
WCK2 WHAT_CHECK Ramachandran: -1.527
WCK3 WHAT_CHECK Chi angles: 0.076
WCK4 WHAT_CHECK Backbone: -0.009

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).