SPACI score report for 3b6g in ASTRAL 1.75:

PDB Entry: 3b6g
SPACI score: 0.01
AEROSPACI score: 0.01

Experiment type: XRAY
Resolution: 3.45
R-factor: 0.341
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.824
WCK2 WHAT_CHECK Ramachandran: -6.427
WCK3 WHAT_CHECK Chi angles: -4.989
WCK4 WHAT_CHECK Backbone: -0.557

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).