[Z (bad) label for palette axis in TH3D

[Wile_E_Coyote]

@couet Maybe you could implement:
h4->SetTitle("h4-Title;XXXXX;YYYYY;ZZZZZ;TTTTT");

Z (bad) label for palette axis in TH3D

Maybe you could define a “T-axis” (ROOT already defines and uses 4 special variable names “x”, “y”, “z”, “t”).