SPACI score report for 1u6g in ASTRAL 2.07:

PDB Entry: 1u6g
SPACI score: 0.14
AEROSPACI score: 0.14

Experiment type: XRAY
Resolution: 3.1
R-factor: 0.243
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.21
WCK2 WHAT_CHECK Ramachandran: -6.722
WCK3 WHAT_CHECK Chi angles: -4.883
WCK4 WHAT_CHECK Backbone: -2.064

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).