SPACI score report for 2xff in ASTRAL 2.06:

PDB Entry: 2xff
SPACI score: 0.79
AEROSPACI score: 0.79

Experiment type: XRAY
Resolution: 1.31
R-factor: 0.123
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.084
WCK2 WHAT_CHECK Ramachandran: -0.674
WCK3 WHAT_CHECK Chi angles: 0.871
WCK4 WHAT_CHECK Backbone: 2.552

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).