SPACI score report for 4ax4 in ASTRAL 2.07:

PDB Entry: 4ax4
SPACI score: 0.61
AEROSPACI score: 0.61

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.16368
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.429
WCK2 WHAT_CHECK Ramachandran: -0.885
WCK3 WHAT_CHECK Chi angles: 0.288
WCK4 WHAT_CHECK Backbone: 2.254

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).