SPACI score report for 1chk in ASTRAL 1.55:

PDB Entry: 1chk
SPACI score: 0.37
AEROSPACI score: 0.37

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.181
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.926
WCK2 WHAT_CHECK Ramachandran: -0.663
WCK3 WHAT_CHECK Chi angles: -1.46
WCK4 WHAT_CHECK Backbone: -1.09

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).