SPACI score report for 2ca8 in ASTRAL 2.07:

PDB Entry: 2ca8
SPACI score: 0.32
AEROSPACI score: 0.32

Experiment type: XRAY
Resolution: 2.49
R-factor: 0.206
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.291
WCK2 WHAT_CHECK Ramachandran: -1.155
WCK3 WHAT_CHECK Chi angles: -1.329
WCK4 WHAT_CHECK Backbone: 2.74

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).