SPACI score report for 1rk0 in ASTRAL 1.73:

PDB Entry: 1rk0
SPACI score: 0.31
AEROSPACI score: 0.31

Experiment type: XRAY
Resolution: 2.61
R-factor: 0.199
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.366
WCK2 WHAT_CHECK Ramachandran: -0.609
WCK3 WHAT_CHECK Chi angles: -0.142
WCK4 WHAT_CHECK Backbone: -3.427

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).