SPACI score report for 1nt3 in ASTRAL 2.05:

PDB Entry: 1nt3
SPACI score: 0.29
AEROSPACI score: 0.29

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.219
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -3.237
WCK2 WHAT_CHECK Ramachandran: -4.363
WCK3 WHAT_CHECK Chi angles: -2.367
WCK4 WHAT_CHECK Backbone: -0.581

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).