SPACI score report for 2xx6 in ASTRAL 2.07:

PDB Entry: 2xx6
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.74
R-factor: 0.17372
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.49
WCK2 WHAT_CHECK Ramachandran: 0.534
WCK3 WHAT_CHECK Chi angles: -0.584
WCK4 WHAT_CHECK Backbone: 1.325

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).