SPACI score report for 1px4 in ASTRAL 1.69:

PDB Entry: 1px4
SPACI score: 0.55
AEROSPACI score: 0.55

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.188
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.805
WCK2 WHAT_CHECK Ramachandran: -0.809
WCK3 WHAT_CHECK Chi angles: -0.929
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).