```r
plot(world[3:6])
plot(world["pop"])
```

<div class="figure" style="text-align: center">
<img src="figures/sfplot-1.png" alt="Plotting with sf, with multiple variables (left) and a single variable (right)." width="49%" /><img src="figures/sfplot-2.png" alt="Plotting with sf, with multiple variables (left) and a single variable (right)." width="49%" />
<p class="caption">(\#fig:sfplot)Plotting with sf, with multiple variables (left) and a single variable (right).</p>
</div>