SPACI score report for 1zwi in ASTRAL 2.07:

PDB Entry: 1zwi
SPACI score: 0.29
AEROSPACI score: 0.29

Experiment type: XRAY
Resolution: 2.5
R-factor: 0.243
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.349
WCK2 WHAT_CHECK Ramachandran: -4.044
WCK3 WHAT_CHECK Chi angles: -3.283
WCK4 WHAT_CHECK Backbone: 2.588

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).