SPACI score report for 1s4q in ASTRAL 1.73:

PDB Entry: 1s4q
SPACI score: 0.42
AEROSPACI score: 0.42

Experiment type: XRAY
Resolution: 2.16
R-factor: 0.18
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.185
WCK2 WHAT_CHECK Ramachandran: 0.399
WCK3 WHAT_CHECK Chi angles: -0.458
WCK4 WHAT_CHECK Backbone: -5.891

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).