SPACI score report for 2ext in ASTRAL 2.07:

PDB Entry: 2ext
SPACI score: 0.51
AEROSPACI score: 0.51

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.192
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.071
WCK2 WHAT_CHECK Ramachandran: -1.393
WCK3 WHAT_CHECK Chi angles: -0.659
WCK4 WHAT_CHECK Backbone: 2.144

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).