Looking at the cell-tower map, e.g. https://opencellid.org/#zoom=17&lat=49.289076&lon=-123.1325, where do I find the legend of the map? For instance, in the following map, what does — a green circle with a 5 in its middle — mean?
https://opencellid.org/#zoom=17&lat=49.289076&lon=-123.1325
