SPACI score report for 3p9g in ASTRAL 2.08:

PDB Entry: 3p9g
SPACI score: 0.51
AEROSPACI score: 0.51

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.197
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.829
WCK2 WHAT_CHECK Ramachandran: -1.264
WCK3 WHAT_CHECK Chi angles: 0.417
WCK4 WHAT_CHECK Backbone: 2.986

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).