SPACI score report for 1b4j in ASTRAL 2.08:

WARNING! The SPACI score for this entry is not valid. The R-factor is not available and an abitrary R-factor has been used. The PROCHECK parameters for this entry could not be obtained, and poor results have been arbitrarily assumed.

PDB Entry: 1b4j
SPACI score: 0.13 (not valid)
AEROSPACI score: -1.87 (not valid) (chimer; see below)

Experiment type: XRAY
Resolution: 2.9
R-factor: 0.25
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -1.575
WCK2 WHAT_CHECK Ramachandran: -5.06
WCK3 WHAT_CHECK Chi angles: -5.414
WCK4 WHAT_CHECK Backbone: 0.594

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase chimer. The full comment is: "part of a chimeric anti-gamma-interferon Fab"

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).