SPACI score report for 1osa in ASTRAL 2.06:

PDB Entry: 1osa
SPACI score: 0.56
AEROSPACI score: 0.56

Experiment type: XRAY
Resolution: 1.68
R-factor: 0.194
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.955
WCK2 WHAT_CHECK Ramachandran: 0.543
WCK3 WHAT_CHECK Chi angles: 0.619
WCK4 WHAT_CHECK Backbone: 2.433

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).