SPACI score report for 2z6m in ASTRAL 2.05:

PDB Entry: 2z6m
SPACI score: 0.3
AEROSPACI score: 0.3

Experiment type: XRAY
Resolution: 2.72
R-factor: 0.215
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.817
WCK2 WHAT_CHECK Ramachandran: -0.839
WCK3 WHAT_CHECK Chi angles: -1.005
WCK4 WHAT_CHECK Backbone: 1.365

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).