SPACI score report for 1ar0 in ASTRAL 1.55:

PDB Entry: 1ar0
SPACI score: 0.36
AEROSPACI score: 0.36 (mutant; see below)

Experiment type: XRAY
Resolution: 2.3
R-factor: 0.19969
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.568
WCK2 WHAT_CHECK Ramachandran: -1.307
WCK3 WHAT_CHECK Chi angles: -1.382
WCK4 WHAT_CHECK Backbone: 0.578

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOP contain the phrase mutant. The full comment is: "mutant"

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).