SPACI score report for 3w3b in ASTRAL 2.07:

PDB Entry: 3w3b
SPACI score: 0.45
AEROSPACI score: 0.45

Experiment type: XRAY
Resolution: 1.9
R-factor: 0.182
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: 1.672
WCK2 WHAT_CHECK Ramachandran: -1.896
WCK3 WHAT_CHECK Chi angles: -2.226
WCK4 WHAT_CHECK Backbone: 2.468

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).