SPACI score report for 1npk in ASTRAL 2.06:

PDB Entry: 1npk
SPACI score: 0.5
AEROSPACI score: 0.5

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.196
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.596
WCK2 WHAT_CHECK Ramachandran: -1.247
WCK3 WHAT_CHECK Chi angles: -1.098
WCK4 WHAT_CHECK Backbone: 0.171

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).