This function creates a theme with all elements blank except for axis lines like a box around the plot.
Arguments
- xlen_npc
The length of the x-axis arrow in "npc".
- ylen_npc
The length of the y-axis arrow in "npc".
- xlab
x-axis label.
- ylab
y-axis label.
- lab_size
Label size.
- ...
Arguments passed to the
theme
.