```
spag_plot <- function(y, DIM = 1, lwd = 1, alpha_value = 0.5, col = "black") {
if (length(dim(y)) != 2) {
stop("Wrong number of dimensions")
}
if (DIM == 2) {
y = t(y)
}
for (i in seq(1, dim(y)[1])) {
if (i == 1) {
plot(y[i, ], ylim = range(y), lwd = lwd, col = alpha(col, alpha_value), type = "l")
} else {
lines(y[i, ], lwd = lwd, col = alpha(col, alpha_value))
}
}
}
```

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