SPACI score report for 1nf4 in ASTRAL 2.03:

PDB Entry: 1nf4
SPACI score: 0.42
AEROSPACI score: 0.42

Experiment type: XRAY
Resolution: 2.05
R-factor: 0.231
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 1.17
WCK2 WHAT_CHECK Ramachandran: 0.618
WCK3 WHAT_CHECK Chi angles: -1.544
WCK4 WHAT_CHECK Backbone: 1.402

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).