Parameter explanations for `tilt_map`

Nobody has claimed this yet.

Hi,

I am having a hard time testing and understanding what does it mean to stretch and tilt a map with `tilt_map`. Therefore I suggest there is a little more explanation on what each parameter of the function mean and maybe a few more examples. How much they vary, within which ranges? What is the meaning of a higher or lower value for each parameter? What is the reference if I want a map which is not rotated/tilted/shifted?

I came to this suggestion because I am trying to plot a series of maps, but with no rotation/tilting, I want to keep maps just as they are (ploting as if I did `plot(x)`) but still plot a pile of them, one in front of another. How can I do it?

Start by locating the `tilt_map` function documentation and its existing examples. Document what each parameter controls, its useful range and reference value, and add examples for unrotated or untilted stacked maps; done means a reader can understand the parameters and reproduce the requested plot.

Written by the indexing model from the issue text.