SPACI score report for 4a0m in ASTRAL 2.06:

PDB Entry: 4a0m
SPACI score: 0.29
AEROSPACI score: 0.29

Experiment type: XRAY
Resolution: 2.3
R-factor: 0.2343
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.639
WCK2 WHAT_CHECK Ramachandran: -2.915
WCK3 WHAT_CHECK Chi angles: -4.144
WCK4 WHAT_CHECK Backbone: 2.098

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).