adding two ggplot "finished" objects

tidyverse
1

Hi,

is there a possibility to add two finished ggplot objects in the sense of overlaying them?

plt1 <- ggplot(mapping = aes(x = XDATA, y = YDATA)) + geom_line()
plt2 <- ggplot(mapping = aes(x = XDATA, y = YDATA2)) + geom_line()

plt3 <- plt1 + plt2

I know I could do plt3 <- plt1 + geom_line(aes(x = XDATA, y = YDATA2)) ) but I have some subroutines which return finished plot objects and I would be interested to add them afterwards?

Thanks a lot!!
Kind regards , Alex

2

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