SPACI score report for 1xxt in ASTRAL 2.04:

PDB Entry: 1xxt
SPACI score: 0.46
AEROSPACI score: 0.46

Experiment type: XRAY
Resolution: 1.91
R-factor: 0.182
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.005
WCK2 WHAT_CHECK Ramachandran: -1.123
WCK3 WHAT_CHECK Chi angles: -3.263
WCK4 WHAT_CHECK Backbone: 1.086

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).