P.subheading(CAP,...)
P [ struct ] - Report object created by the report.new function.
CAP [ char ] - Text displayed as a subheading on a separate line in the table.
'justify=' [ 'c' | 'l' | 'r' ] - (Inheritable from parent objects) Horizontal alignment of the subheading (centre, left, right).
'separator=' [ char | empty ] - (Not inheritable from parent objects) LaTeX commands that will be inserted immediately after the end of the table row, i.e. appended to \, within a tabular mode.
'stretch=' [ true | false ] - (Inheritable from parent objects) Stretch the subheading text also across the data part of the table; if not the text will be contained within the initial descriptive columns.
'typeface=' [ char | '\itshape\bfseries' ] - (Not inheritable from parent objects) LaTeX code specifying the typeface for the subheading; it must use the declarative forms (such as \itshape) and not the command forms (such as \textit{...}).
See help on generic options in report objects.