SPACI score report for 1b55 in ASTRAL 1.65:

PDB Entry: 1b55
SPACI score: 0.22
AEROSPACI score: 0.22

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.234
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 4
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.567
WCK2 WHAT_CHECK Ramachandran: -4.125
WCK3 WHAT_CHECK Chi angles: -3.14
WCK4 WHAT_CHECK Backbone: -1.598

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).