SPACI score report for 2xbs in ASTRAL 2.07:

PDB Entry: 2xbs
SPACI score: 0.74
AEROSPACI score: 0.74

Experiment type: XRAY
Resolution: 1.37
R-factor: 0.14948
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.468
WCK2 WHAT_CHECK Ramachandran: -0.673
WCK3 WHAT_CHECK Chi angles: -0.103
WCK4 WHAT_CHECK Backbone: 0.239

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).