SPACI score report for 1a4z in ASTRAL 2.08:

PDB Entry: 1a4z
SPACI score: 0.25
AEROSPACI score: 0.25

Experiment type: XRAY
Resolution: 2.75
R-factor: 0.23
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.864
WCK2 WHAT_CHECK Ramachandran: -2.595
WCK3 WHAT_CHECK Chi angles: -2.761
WCK4 WHAT_CHECK Backbone: -0.503

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).