SPACI score report for 2zxx in ASTRAL 2.06:

PDB Entry: 2zxx
SPACI score: 0.2
AEROSPACI score: 0.2

Experiment type: XRAY
Resolution: 2.8
R-factor: 0.237
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.772
WCK2 WHAT_CHECK Ramachandran: -5.324
WCK3 WHAT_CHECK Chi angles: -4.996
WCK4 WHAT_CHECK Backbone: 0.594

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).