SPACI score report for 3cg2 in ASTRAL 2.06:

PDB Entry: 3cg2
SPACI score: 0.17
AEROSPACI score: 0.17

Experiment type: XRAY
Resolution: 2.15
R-factor: 0.296
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 4
PCK3 PROCHECK H-bonds: 4
WCK1 WHAT_CHECK Packing: -3.071
WCK2 WHAT_CHECK Ramachandran: -6.704
WCK3 WHAT_CHECK Chi angles: -7.12
WCK4 WHAT_CHECK Backbone: -0.934

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).