[If] one says to another, “I am selling you half the field,” they divide [the field] between them qualitatively, and he takes half his field. [If he said,] “I am selling you its southern half,” they divide [the field] between them qual-itatively, and he takes [equal to] its southern half. He accepts upon himself the place for the fence, a [wide] ditch, and a narrow ditch. How wide is a [wide] ditch? Six handbreadths. And the narrow ditch? Three [handbreadths].