SPACI score report for 1xbz in ASTRAL 2.06:

PDB Entry: 1xbz
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.17
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.852
WCK2 WHAT_CHECK Ramachandran: -0.298
WCK3 WHAT_CHECK Chi angles: -1.35
WCK4 WHAT_CHECK Backbone: 0.33

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).