SPACI score report for 1a2o in ASTRAL 2.08:

PDB Entry: 1a2o
SPACI score: 0.27
AEROSPACI score: 0.27

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.225
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.095
WCK2 WHAT_CHECK Ramachandran: -3.669
WCK3 WHAT_CHECK Chi angles: -5.091
WCK4 WHAT_CHECK Backbone: -1.727

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).