SPACI score report for 3R6J in ASTRAL 2.06:

PDB Entry: 3R6J
SPACI score: 0.53
AEROSPACI score: 0.53

Experiment type: XRAY
Resolution: 1.75
R-factor: 0.187
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.904
WCK2 WHAT_CHECK Ramachandran: -0.98
WCK3 WHAT_CHECK Chi angles: -0.454
WCK4 WHAT_CHECK Backbone: 2.053

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).