SPACI score report for 1s73 in ASTRAL 2.05:

PDB Entry: 1s73
SPACI score: 0.62
AEROSPACI score: 0.62

Experiment type: XRAY
Resolution: 1.53
R-factor: 0.183
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.938
WCK2 WHAT_CHECK Ramachandran: -0.065
WCK3 WHAT_CHECK Chi angles: 0.945
WCK4 WHAT_CHECK Backbone: 0.573

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).