*.matset4"

This is space distribution with gmsh 2.0.8 format. This one is for

pz px py

Please use gmsh to load the msh file and merge this file to plot the 3D distribution.

See Alsp *.np
*.out
*.Ev
*.ef
*.Err
*.T
*.L
*.Lp
*.LpLH
*.Rad
*.nonRad
*.Auger
*.pHHLH
*.nda
*.Trap
*.gen (3D)
*.Evhhlh
*.E
*.Jn
*.Jp
*.Jns
*.Jps
*.impactG
*.heatsource"
*.matset1
*.matset4
*.matset2
*.matset3