SPACI score report for 1ssg in ASTRAL 1.71:

PDB Entry: 1ssg
SPACI score: 0.25
AEROSPACI score: 0.25

Experiment type: XRAY
Resolution: 2.9
R-factor: 0.207
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.621
WCK2 WHAT_CHECK Ramachandran: -1.615
WCK3 WHAT_CHECK Chi angles: -2.287
WCK4 WHAT_CHECK Backbone: -3.327

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).