SPACI score report for 1si9 in ASTRAL 2.07:

PDB Entry: 1si9
SPACI score: 0.38
AEROSPACI score: 0.38

Experiment type: XRAY
Resolution: 2.27
R-factor: 0.209
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -1.05
WCK2 WHAT_CHECK Ramachandran: -1.043
WCK3 WHAT_CHECK Chi angles: -1.764
WCK4 WHAT_CHECK Backbone: 4.148

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).