SPACI score report for 2byx in ASTRAL 1.73:

PDB Entry: 2byx
SPACI score: 0.46
AEROSPACI score: 0.46

Experiment type: XRAY
Resolution: 2
R-factor: 0.171
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.711
WCK2 WHAT_CHECK Ramachandran: -1.23
WCK3 WHAT_CHECK Chi angles: 0.217
WCK4 WHAT_CHECK Backbone: -7.257

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).