SPACI score report for 2cl6 in ASTRAL 2.04:

PDB Entry: 2cl6
SPACI score: 0.8
AEROSPACI score: 0.8

Experiment type: XRAY
Resolution: 1.24
R-factor: 0.148
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.395
WCK2 WHAT_CHECK Ramachandran: -1.779
WCK3 WHAT_CHECK Chi angles: -1.12
WCK4 WHAT_CHECK Backbone: 3.603

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).