SPACI score report for 4f6h in ASTRAL 2.06:

PDB Entry: 4f6h
SPACI score: 0.52
AEROSPACI score: 0.52

Experiment type: XRAY
Resolution: 1.74
R-factor: 0.197
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.026
WCK2 WHAT_CHECK Ramachandran: -1.56
WCK3 WHAT_CHECK Chi angles: -1.214
WCK4 WHAT_CHECK Backbone: 2.266

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).