SPACI score report for 1a6u in ASTRAL 1.65:

PDB Entry: 1a6u
SPACI score: 0.45
AEROSPACI score: 0.45

Experiment type: XRAY
Resolution: 2
R-factor: 0.192
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.807
WCK2 WHAT_CHECK Ramachandran: -0.988
WCK3 WHAT_CHECK Chi angles: -1.019
WCK4 WHAT_CHECK Backbone: 0.231

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).