SPACI score report for 3qb6 in ASTRAL 2.08:

PDB Entry: 3qb6
SPACI score: 0.19
AEROSPACI score: 0.19

Experiment type: XRAY
Resolution: 3
R-factor: 0.229
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.902
WCK2 WHAT_CHECK Ramachandran: -4.478
WCK3 WHAT_CHECK Chi angles: -3.669
WCK4 WHAT_CHECK Backbone: 1.464

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).