SPACI score report for 1g4a in ASTRAL 1.55:

PDB Entry: 1g4a
SPACI score: 0.1
AEROSPACI score: 0.1

Experiment type: XRAY
Resolution: 3
R-factor: 0.257
PCK1 PROCHECK Ramachandran: 3
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -3.993
WCK2 WHAT_CHECK Ramachandran: -6.039
WCK3 WHAT_CHECK Chi angles: -3.283
WCK4 WHAT_CHECK Backbone: -4.129

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).