Minefields consist of an integer number of minefield units. From that, the minefield's radius is computed:
Minefield_radius = Sqrt(Mine_units)
Internally, PHost generally uses that exact value. In messages, the radius is reported as Trunc(Minefield_radius), the diameter is reported as 2 * Trunc(Minefield_radius).
Some clients evaluate the Mine_units directly to plot minefields a little more exact. For example, PCC plots Round(Minefield_radius).
