SPACI score report for 1g4a in ASTRAL 2.01:

PDB Entry: 1g4a
SPACI score: 0.09
AEROSPACI score: 0.09

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: -3.272
WCK2 WHAT_CHECK Ramachandran: -7.561
WCK3 WHAT_CHECK Chi angles: -5.757
WCK4 WHAT_CHECK Backbone: -3.785

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).