SPACI score report for 2ah4 in ASTRAL 2.06:

PDB Entry: 2ah4
SPACI score: 0.92
AEROSPACI score: 0.92

Experiment type: XRAY
Resolution: 1.13
R-factor: 0.12
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 3.521
WCK2 WHAT_CHECK Ramachandran: -0.196
WCK3 WHAT_CHECK Chi angles: 0.539
WCK4 WHAT_CHECK Backbone: 1.995

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).