Macro Language Reference > PIs > Maths > <?tcustr4>
  
<?tcustr4>
Description
Specifies the default rule width for scscscstyle text in Maths, which is used for 3rd level sub- & superscripts and 4th level fractions.
 
This rule width setting also affects the gaps between joint sub- and superscripts, the bars over roots and the gap between the fraction bar and the numerator and denominator.
Syntax
<?tcustr4 rule4:um?>
<?tcustr4>
[no parameter]
Invoke the tcustr4 dialog box.
rule4
The width of the rule: to one decimal place.