English to Spanish Tech/Engineering dibujo industrial

Setting tolerance in both top and bottom rows
Click on the [Horizontal] option button for a dimension to which a two-row dimensional tolerance is to be assigned. The corresponding text box will open to allow the tolerance to be entered.
Example: If "+0.05" and "+0.02" are entered respectively in the upper and lower rows of the text box, "+0.05" and "+0.02" will be added correspondingly after the dimensions.

Nota: es un manual de instrucciones de un programa de ayuda al dibujo. Sé que se trata de definir la tolerancia, pero no se cómo traducir "for both top and bottom ROWS"