SPACI score report for 2xbx in ASTRAL 2.01:

PDB Entry: 2xbx
SPACI score: 0.5
AEROSPACI score: 0.5

Experiment type: XRAY
Resolution: 1.85
R-factor: 0.195
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.225
WCK2 WHAT_CHECK Ramachandran: 0.138
WCK3 WHAT_CHECK Chi angles: 0.633
WCK4 WHAT_CHECK Backbone: -0.024

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).