SPACI score report for 2i06 in ASTRAL 2.07:

PDB Entry: 2i06
SPACI score: 0.35
AEROSPACI score: 0.35

Experiment type: XRAY
Resolution: 2.2
R-factor: 0.221
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.527
WCK2 WHAT_CHECK Ramachandran: -2.427
WCK3 WHAT_CHECK Chi angles: -3.708
WCK4 WHAT_CHECK Backbone: 3.239

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).