SPACI score report for 1a4o in ASTRAL 2.06:

PDB Entry: 1a4o
SPACI score: 0.13
AEROSPACI score: 0.13

Experiment type: XRAY
Resolution: 2.8
R-factor: 0.31
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.348
WCK2 WHAT_CHECK Ramachandran: -5.885
WCK3 WHAT_CHECK Chi angles: -5.866
WCK4 WHAT_CHECK Backbone: 0.163

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).