SPACI score report for 3a8g in ASTRAL 2.07:

WARNING! The SPACI score for this entry is not valid. The PROCHECK parameters for this entry could not be obtained, and poor results have been arbitrarily assumed.

PDB Entry: 3a8g
SPACI score: 0.83 (not valid)
AEROSPACI score: 0.83 (not valid)

Experiment type: XRAY
Resolution: 1.11
R-factor: 0.143
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -0.578
WCK2 WHAT_CHECK Ramachandran: 0.034
WCK3 WHAT_CHECK Chi angles: 0.752
WCK4 WHAT_CHECK Backbone: 3.745

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).