SPACI score report for 1zc3 in ASTRAL 1.75:

PDB Entry: 1zc3
SPACI score: 0.51
AEROSPACI score: 0.51

Experiment type: XRAY
Resolution: 2
R-factor: 0.206
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.511
WCK2 WHAT_CHECK Ramachandran: -0.591
WCK3 WHAT_CHECK Chi angles: -1.518
WCK4 WHAT_CHECK Backbone: 0.658

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).