SPACI score report for 4esp in ASTRAL 2.06:

PDB Entry: 4esp
SPACI score: 0.9
AEROSPACI score: 0.9

Experiment type: XRAY
Resolution: 1.1
R-factor: 0.169
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.421
WCK2 WHAT_CHECK Ramachandran: -1.186
WCK3 WHAT_CHECK Chi angles: -0.852
WCK4 WHAT_CHECK Backbone: 3.233

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).