SPACI score report for 2a26 in ASTRAL 2.07:

PDB Entry: 2a26
SPACI score: 0.85
AEROSPACI score: 0.85

Experiment type: XRAY
Resolution: 1.2
R-factor: 0.175
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 2.432
WCK2 WHAT_CHECK Ramachandran: 2.471
WCK3 WHAT_CHECK Chi angles: 3.677
WCK4 WHAT_CHECK Backbone: 1.467

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).