SPACI score report for 16gs in ASTRAL 2.08:

PDB Entry: 16gs
SPACI score: 0.42
AEROSPACI score: 0.42

Experiment type: XRAY
Resolution: 1.9
R-factor: 0.227
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.835
WCK2 WHAT_CHECK Ramachandran: -0.99
WCK3 WHAT_CHECK Chi angles: -0.905
WCK4 WHAT_CHECK Backbone: -0.732

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).