SPACI score report for 2byk in ASTRAL 1.73:

PDB Entry: 2byk
SPACI score: 0.3
AEROSPACI score: 0.3

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.237
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 3.916
WCK2 WHAT_CHECK Ramachandran: -2.974
WCK3 WHAT_CHECK Chi angles: -0.988
WCK4 WHAT_CHECK Backbone: -2.476

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).