SPACI score report for 1r4b in ASTRAL 2.07:

PDB Entry: 1r4b
SPACI score: 0.51
AEROSPACI score: 0.51

Experiment type: XRAY
Resolution: 1.85
R-factor: 0.164
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.997
WCK2 WHAT_CHECK Ramachandran: -0.168
WCK3 WHAT_CHECK Chi angles: 0.135
WCK4 WHAT_CHECK Backbone: 0.272

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).