SPACI score report for 1ltw in ASTRAL 2.07:

PDB Entry: 1ltw
SPACI score: 0.57
AEROSPACI score: 0.57

Experiment type: XRAY
Resolution: 1.7
R-factor: 0.158
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.256
WCK2 WHAT_CHECK Ramachandran: -1.449
WCK3 WHAT_CHECK Chi angles: -1.068
WCK4 WHAT_CHECK Backbone: 1.208

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).