SPACI score report for 1mg3 in ASTRAL 1.63:

PDB Entry: 1mg3
SPACI score: 0.35
AEROSPACI score: 0.35

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.193
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.317
WCK2 WHAT_CHECK Ramachandran: -2.134
WCK3 WHAT_CHECK Chi angles: -0.728
WCK4 WHAT_CHECK Backbone: 0.201

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).