SPACI score report for 1x6i in ASTRAL 2.07:

PDB Entry: 1x6i
SPACI score: 0.84
AEROSPACI score: 0.84

Experiment type: XRAY
Resolution: 1.2
R-factor: 0.171
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.712
WCK2 WHAT_CHECK Ramachandran: 0.384
WCK3 WHAT_CHECK Chi angles: 2.931
WCK4 WHAT_CHECK Backbone: 0.436

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).