SPACI score report for 1xbu in ASTRAL 2.07:

PDB Entry: 1xbu
SPACI score: 0.86
AEROSPACI score: 0.86

Experiment type: XRAY
Resolution: 1.2
R-factor: 0.127
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.18
WCK2 WHAT_CHECK Ramachandran: 0.322
WCK3 WHAT_CHECK Chi angles: 0.254
WCK4 WHAT_CHECK Backbone: 0.564

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).