SPACI score report for 1r4z in ASTRAL 2.07:

PDB Entry: 1r4z
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.177
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.507
WCK2 WHAT_CHECK Ramachandran: -0.753
WCK3 WHAT_CHECK Chi angles: 1.575
WCK4 WHAT_CHECK Backbone: -0.378

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).