The `set xmtics` commands converts the x-axis tic marks to months of the
year where 1=Jan and 12=Dec. Overflows are converted modulo 12 to months.
The tics are returned to their default labels by `set noxmtics`. Similar
commands perform the same duties for the other axes.
Syntax:
set xmtics
set noxmtics
show xmtics
The same syntax applies to `x2mtics` (Note:x2mtics ), `ymtics`
(Note:ymtics ), `y2mtics` (Note:y2mtics ), and `zmtics`
(Note:zmtics ).
See also the `set format` (Note:format ) command.