SPACI score report for 4trd in ASTRAL 2.05:

WARNING! The SPACI score for this entry is not valid. The PROCHECK parameters for this entry could not be obtained, and poor results have been arbitrarily assumed.

PDB Entry: 4trd
SPACI score: 0.52 (not valid)
AEROSPACI score: 0.52 (not valid)

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.171
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -1.603
WCK2 WHAT_CHECK Ramachandran: -0.639
WCK3 WHAT_CHECK Chi angles: 1.006
WCK4 WHAT_CHECK Backbone: 2.674

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).