SPACI score report for 1aa4 in ASTRAL 1.71:

PDB Entry: 1aa4
SPACI score: 0.41
AEROSPACI score: 0.41

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.189
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.222
WCK2 WHAT_CHECK Ramachandran: -0.81
WCK3 WHAT_CHECK Chi angles: -0.519
WCK4 WHAT_CHECK Backbone: -3.575

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).