Some functions in ggh4x are using extensions to the theme system. These extended theme argument are listed below, along with what elements they are expected to be, and in what function(s) they are used.
An element_line()
used as the parent for the nest_line argument in facet_nested() and
facet_nested_wrap(). Inherits directly from the 'line' theme element.
An
element_line() used as the line to separate
different layers of labels in guide_axis_nested(). Inherits from the
'axis.ticks' theme element.
An
element_text() used to differentiate text higher
in the hierarchy from the axis labels directly next to the axis line in
guide_axis_nested(). Inherits from the 'axis.text.x' and
'axis.text.y' theme elements respectively.
A rel() object used to
set the size of minor tick marks relative to the regular tick marks. This
is used in the guide_axis_minor() and guide_axis_logticks()
functions. Defaults to rel(2/3).
A rel() object used to
set the size of the smallest tick marks relative to regular tick marks.
This is only used in the guide_axis_logticks() function.
Defaults to rel(1/3).