SPACI score report for 4tss in ASTRAL 1.73:

PDB Entry: 4tss
SPACI score: 0.21
AEROSPACI score: 0.21

Experiment type: XRAY
Resolution: 2.75
R-factor: 0.191
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.083
WCK2 WHAT_CHECK Ramachandran: -6.005
WCK3 WHAT_CHECK Chi angles: -4.44
WCK4 WHAT_CHECK Backbone: -8.679

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).