SPACI score report for 2q4a in ASTRAL 2.08:

PDB Entry: 2q4a
SPACI score: 0.36
AEROSPACI score: 0.36

Experiment type: XRAY
Resolution: 2.39
R-factor: 0.171
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.995
WCK2 WHAT_CHECK Ramachandran: -3.061
WCK3 WHAT_CHECK Chi angles: -2.127
WCK4 WHAT_CHECK Backbone: 2.037

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).