SPACI score report for 2c9a in ASTRAL 2.05:

PDB Entry: 2c9a
SPACI score: 0.24
AEROSPACI score: 0.24

Experiment type: XRAY
Resolution: 2.7
R-factor: 0.225
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.242
WCK2 WHAT_CHECK Ramachandran: -2.812
WCK3 WHAT_CHECK Chi angles: -4.182
WCK4 WHAT_CHECK Backbone: 1.15

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).