SPACI score report for 3a2f in ASTRAL 2.05:

PDB Entry: 3a2f
SPACI score: 0.24
AEROSPACI score: 0.24

Experiment type: XRAY
Resolution: 2.67
R-factor: 0.241
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.449
WCK2 WHAT_CHECK Ramachandran: -3.724
WCK3 WHAT_CHECK Chi angles: -2.879
WCK4 WHAT_CHECK Backbone: -0.29

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).