SPACI score report for 4ar4 in ASTRAL 2.02:

WARNING! The SPACI score for this entry is not valid. This is not an X-ray structure, so the resolution and R-factor listed may be arbitrary and not valid.

PDB Entry: 4ar4
SPACI score: 0.7 (not valid)
AEROSPACI score: 0.7 (not valid)

Experiment type: NEUT
Resolution: 1.38
R-factor: 0.1881
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.359
WCK2 WHAT_CHECK Ramachandran: 2.437
WCK3 WHAT_CHECK Chi angles: 1.633
WCK4 WHAT_CHECK Backbone: 4.73

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).