SPACI score report for 3t06 in ASTRAL 2.03:

PDB Entry: 3t06
SPACI score: 0.24
AEROSPACI score: 0.24

Experiment type: XRAY
Resolution: 2.84
R-factor: 0.21
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.413
WCK2 WHAT_CHECK Ramachandran: -3.313
WCK3 WHAT_CHECK Chi angles: -4.623
WCK4 WHAT_CHECK Backbone: 3.359

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).