SPACI score report for 1c4o in ASTRAL 1.57:

PDB Entry: 1c4o
SPACI score: 0.57
AEROSPACI score: 0.57

Experiment type: XRAY
Resolution: 1.5
R-factor: 0.252
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.413
WCK2 WHAT_CHECK Ramachandran: 0.824
WCK3 WHAT_CHECK Chi angles: 1.389
WCK4 WHAT_CHECK Backbone: 0.462

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).