Macro Language Reference > PIs > Maths > <?tptxbb>
  
<?tptxbb>
Description
Instructs PTC ALD to always measure from the bottom of Maths text when assessing paragraph breaks, to ensure that descenders are included in the assessment. By default, PTC ALD usually measures from the text baseline.
Syntax
<?tptxbb on_off:o?>
<?tptxbb>
[no parameter]
Invoke the Maths - breaks are always measured from bottom dialog box.
on_off
0
Deactivate the measure breaks from bottom option.
1
Activate the measure breaks from bottom option.