## S3 method for class 'df_curves':
plot(x, multiple = FALSE,
ylim = c(range(mapply(function(i) range(x[[i]][, 2]),
seq(x)))) * 100, xlim = c(), type = "l", lty = 1, lwd = 2,
expoints = NULL, ylab = "Discount factor (percent)",
xlab = "Maturity (years)", main = "Discount factor curves", ...)