SPACI score report for 1k6w in ASTRAL 2.04:

PDB Entry: 1k6w
SPACI score: 0.56
AEROSPACI score: 0.56

Experiment type: XRAY
Resolution: 1.75
R-factor: 0.155
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.117
WCK2 WHAT_CHECK Ramachandran: -0.952
WCK3 WHAT_CHECK Chi angles: 1.236
WCK4 WHAT_CHECK Backbone: -0.647

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).