SPACI score report for 1twh in ASTRAL 2.02:

PDB Entry: 1twh
SPACI score: 0.15
AEROSPACI score: 0.15

Experiment type: XRAY
Resolution: 3.4
R-factor: 0.222
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.005
WCK2 WHAT_CHECK Ramachandran: -4.633
WCK3 WHAT_CHECK Chi angles: -5.03
WCK4 WHAT_CHECK Backbone: -1.976

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).