SPACI score report for 3cue in ASTRAL 2.06:

PDB Entry: 3cue
SPACI score: 0.05
AEROSPACI score: 0.05

Experiment type: XRAY
Resolution: 3.7
R-factor: 0.265
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -3.136
WCK2 WHAT_CHECK Ramachandran: -4.577
WCK3 WHAT_CHECK Chi angles: -5.547
WCK4 WHAT_CHECK Backbone: 1.45

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).