SPACI score report for 1a4j in ASTRAL 1.57:

PDB Entry: 1a4j
SPACI score: 0.33
AEROSPACI score: 0.33

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.229
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -1.038
WCK2 WHAT_CHECK Ramachandran: -1.224
WCK3 WHAT_CHECK Chi angles: -2.523
WCK4 WHAT_CHECK Backbone: 0.729

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).