The labels along each ReachableRangesModule range's border.
Optional
Each range's title, the text of its labels. If unset, it is the range's budget, e.g. '30 min' or '10 km', otherwise its position in what show was given, from 1.
budget
'30 min'
'10 km'
show
The labels along each ReachableRangesModule range's border.