SPACI score report for 1mhn in ASTRAL 1.75:

PDB Entry: 1mhn
SPACI score: 0.66
AEROSPACI score: 0.66

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.147
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.853
WCK2 WHAT_CHECK Ramachandran: 0.477
WCK3 WHAT_CHECK Chi angles: 0.347
WCK4 WHAT_CHECK Backbone: 1.396

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).