SPACI score report for 1byo in ASTRAL 2.07:

PDB Entry: 1byo
SPACI score: 0.41
AEROSPACI score: 0.41

Experiment type: XRAY
Resolution: 2
R-factor: 0.189
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.086
WCK2 WHAT_CHECK Ramachandran: -1.66
WCK3 WHAT_CHECK Chi angles: -3.493
WCK4 WHAT_CHECK Backbone: -0.341

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).