SPACI score report for 4u6h in ASTRAL 2.07:

WARNING! The SPACI score for this entry is not valid. The R-factor is not available and an abitrary R-factor has been used. The PROCHECK parameters for this entry could not be obtained, and poor results have been arbitrarily assumed.

PDB Entry: 4u6h
SPACI score: 0.13 (not valid)
AEROSPACI score: 0.13 (not valid)

Experiment type: XRAY
Resolution: 3.1
R-factor: 0.25
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -0.459
WCK2 WHAT_CHECK Ramachandran: -2.537
WCK3 WHAT_CHECK Chi angles: -1.892
WCK4 WHAT_CHECK Backbone: 3.034

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).