Dear Jonas Stein,
You may add a line defining a large margin to harbour the legend,
such as:
par(mai=c(0.5, 0.5, 0.5, 1.8)) # enlarged right margin
plot(1:10)
legend("right", legend=c("one", "two"), inset=-0.2, xpd=NA)
Kind regards,
Franklin Bretschneider
--
Dept Biologie
Kruytgebouw W711
Padualaan 8
3584 CH Utrecht
The Netherlands