SPACI score report for 1b6w in ASTRAL 2.08:

PDB Entry: 1b6w
SPACI score: 0.45
AEROSPACI score: 0.45

Experiment type: XRAY
Resolution: 2.05
R-factor: 0.21
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 1.381
WCK2 WHAT_CHECK Ramachandran: -0.591
WCK3 WHAT_CHECK Chi angles: 0.452
WCK4 WHAT_CHECK Backbone: 5.886

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).