SPACI score report for 3df4 in ASTRAL 2.02:

PDB Entry: 3df4
SPACI score: 0.03
AEROSPACI score: 0.03

Experiment type: XRAY
Resolution: 3.5
R-factor: 0.269
PCK1 PROCHECK Ramachandran: 3
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -4.842
WCK2 WHAT_CHECK Ramachandran: -7.711
WCK3 WHAT_CHECK Chi angles: -5.919
WCK4 WHAT_CHECK Backbone: -5.225

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).