Use in place of print.ggplot with a jagged facet_wrap
to label all the horizontal axes.
1  | facet_adjust(x, pos = c("up", "down"), newpage = is.null(vp), vp = NULL)
 | 
x | 
 ggplot object to print  | 
pos | 
 position of the added axes.   | 
newpage | 
 draw new (empty) page first?  | 
vp | 
 viewport to draw plot in  | 
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