SPACI score report for 1g3k in ASTRAL 1.75:

PDB Entry: 1g3k
SPACI score: 0.56
AEROSPACI score: 0.56

Experiment type: XRAY
Resolution: 1.9
R-factor: 0.2
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.343
WCK2 WHAT_CHECK Ramachandran: 0.351
WCK3 WHAT_CHECK Chi angles: -0.787
WCK4 WHAT_CHECK Backbone: 0.135

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).