SPACI score report for 1b4l in ASTRAL 2.08:

PDB Entry: 1b4l
SPACI score: 0.49
AEROSPACI score: 0.49

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.2
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 2.279
WCK2 WHAT_CHECK Ramachandran: 0.001
WCK3 WHAT_CHECK Chi angles: -1.172
WCK4 WHAT_CHECK Backbone: 1.436

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).