SPACI score report for 3btw in ASTRAL 2.07:

PDB Entry: 3btw
SPACI score: 0.43
AEROSPACI score: 0.43

Experiment type: XRAY
Resolution: 2.05
R-factor: 0.191
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 2.32
WCK2 WHAT_CHECK Ramachandran: -1.373
WCK3 WHAT_CHECK Chi angles: -0.649
WCK4 WHAT_CHECK Backbone: 1.218

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).