SPACI score report for 2a8t in ASTRAL 1.73:

PDB Entry: 2a8t
SPACI score: 0.39
AEROSPACI score: 0.39

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.217
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.93
WCK2 WHAT_CHECK Ramachandran: -0.885
WCK3 WHAT_CHECK Chi angles: -0.064
WCK4 WHAT_CHECK Backbone: -6.115

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).