SPACI score report for 3krx in ASTRAL 2.07:

PDB Entry: 3krx
SPACI score: 0.22
AEROSPACI score: 0.22

Experiment type: XRAY
Resolution: 3.1
R-factor: 0.232
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.005
WCK2 WHAT_CHECK Ramachandran: -2.693
WCK3 WHAT_CHECK Chi angles: -1.934
WCK4 WHAT_CHECK Backbone: -0.067

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).