SPACI score report for 2rtn in ASTRAL 2.08:

PDB Entry: 2rtn
SPACI score: 0.41
AEROSPACI score: 0.41

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.276
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -1.857
WCK2 WHAT_CHECK Ramachandran: -2.811
WCK3 WHAT_CHECK Chi angles: -3.195
WCK4 WHAT_CHECK Backbone: 1.959

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).