SPACI score report for 6hhm in ASTRAL 2.08:

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: 6hhm
SPACI score: 0.63 (not valid)
AEROSPACI score: 0.63 (not valid)

Experiment type: XRAY
Resolution: 1.23
R-factor: 0.25
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -1.992
WCK2 WHAT_CHECK Ramachandran: -0.681
WCK3 WHAT_CHECK Chi angles: 0.783
WCK4 WHAT_CHECK Backbone: 2.341

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).