SPACI score report for 3n22 in ASTRAL 2.06:

PDB Entry: 3n22
SPACI score: 0.77
AEROSPACI score: 0.77

Experiment type: XRAY
Resolution: 1.3
R-factor: 0.149
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.128
WCK2 WHAT_CHECK Ramachandran: 0.448
WCK3 WHAT_CHECK Chi angles: 1.26
WCK4 WHAT_CHECK Backbone: 0.555

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).