Number of divisions on palette

[Pepe_Le_Pew]

Warnings concerning a “logarithmic palette”:

TGraph2D: logarithmic z-axis

Both ROOT 5.34/36 and 6.06/04 behave the same way. The graph is drawn with log-z but the color is still linear-z (improperly shown in the palette’s axis as being log, too).

Problem with logarithmic color axis/colz with TNtuple

This seems to be a bug in ROOT (the numbers on the “z” scale, i.e. on the color palette, are wrong in “Logz” mode) and it seems to be closely related to How plot only fit result of the TGraph?