SPACI score report for 1i6m in ASTRAL 1.69:

PDB Entry: 1i6m
SPACI score: 0.48
AEROSPACI score: 0.48

Experiment type: XRAY
Resolution: 1.72
R-factor: 0.225
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.139
WCK2 WHAT_CHECK Ramachandran: 0.381
WCK3 WHAT_CHECK Chi angles: -0.703
WCK4 WHAT_CHECK Backbone: -3.016

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).