\BeginKnitrBlock{rmdnote}<div class="rmdnote">`qtm()` is a handy function for **q**uickly creating **t**map **m**aps (hence the snappy name).
It is concise and provides a good default visualization in many cases:
`qtm(nz)`, for example, is equivalent to `tm_shape(nz) + tm_fill() + tm_borders()`.
Further, layers can be added concisely using multiple `qtm()` calls, such as `qtm(nz) + qtm(nz_height)`.
The disadvantage is that it makes aesthetics of individual layers harder to control, explaining why we avoid teaching it in this chapter.</div>\EndKnitrBlock{rmdnote}