SPACI score report for 3osi in ASTRAL 2.02:

PDB Entry: 3osi
SPACI score: 0.31
AEROSPACI score: 0.31

Experiment type: XRAY
Resolution: 2.7
R-factor: 0.177
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.729
WCK2 WHAT_CHECK Ramachandran: -2.801
WCK3 WHAT_CHECK Chi angles: -3.203
WCK4 WHAT_CHECK Backbone: 4.485

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).