SPACI score report for 3m4g in ASTRAL 2.04:

PDB Entry: 3m4g
SPACI score: 0.42
AEROSPACI score: 0.42

Experiment type: XRAY
Resolution: 2.05
R-factor: 0.203
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.283
WCK2 WHAT_CHECK Ramachandran: -2.011
WCK3 WHAT_CHECK Chi angles: -0.691
WCK4 WHAT_CHECK Backbone: -0.036

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).