SPACI score report for 1a73 in ASTRAL 1.55:

PDB Entry: 1a73
SPACI score: 0.47
AEROSPACI score: 0.47

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.208
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.617
WCK2 WHAT_CHECK Ramachandran: -0.101
WCK3 WHAT_CHECK Chi angles: -0.773
WCK4 WHAT_CHECK Backbone: -0.228

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).