SPACI score report for 3vf6 in ASTRAL 2.05:

PDB Entry: 3vf6
SPACI score: 0.51
AEROSPACI score: 0.51

Experiment type: XRAY
Resolution: 1.86
R-factor: 0.177
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.697
WCK2 WHAT_CHECK Ramachandran: -1.062
WCK3 WHAT_CHECK Chi angles: -0.99
WCK4 WHAT_CHECK Backbone: 2.877

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).