Instructs PTC ALD to measure text from the bottom of the text line instead of from the baseline when fitting a line of text into a column. With this option set there must be sufficient space left in the column to fit descenders, otherwise the line will be taken over to the next column. This affects the way text is vertically centered in a column, flushed to the bottom, or vertically justified; it also means that paragraph rules are taken into account during the fit calculation.