SPACI score report for 2gtw in ASTRAL 1.73:

PDB Entry: 2gtw
SPACI score: 0.61
AEROSPACI score: 0.61

Experiment type: XRAY
Resolution: 1.55
R-factor: 0.183
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 2.326
WCK2 WHAT_CHECK Ramachandran: 1.09
WCK3 WHAT_CHECK Chi angles: 0.353
WCK4 WHAT_CHECK Backbone: -3.667

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).