SPACI score report for 1xwk in ASTRAL 1.75:

PDB Entry: 1xwk
SPACI score: 0.4
AEROSPACI score: 0.4

Experiment type: XRAY
Resolution: 2.3
R-factor: 0.243
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.409
WCK2 WHAT_CHECK Ramachandran: -3.571
WCK3 WHAT_CHECK Chi angles: -0.532
WCK4 WHAT_CHECK Backbone: -1.374

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).