SPACI score report for 2w4j in ASTRAL 2.04:

PDB Entry: 2w4j
SPACI score: 0.79
AEROSPACI score: 0.79

Experiment type: XRAY
Resolution: 1.3
R-factor: 0.132
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.239
WCK2 WHAT_CHECK Ramachandran: 0.002
WCK3 WHAT_CHECK Chi angles: 1.389
WCK4 WHAT_CHECK Backbone: 0.822

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).