You can find my dataset [here](https://drive.google.com/open?id=0B8clGpnMSCjUdTRXNjBNMktkdVE).

From this data, I wish to plot (one line for each):

```
x$y[,1]
x$y[,5]
x$y[,1]+x$y[,5]

```

Therefore, more clearly, in the end, each of the following will be represented by one line:

```
y0, 
z0, 
y0+z0

```

My x-axis (time-series) will be from `x$t`.

I have tried the following, but the time-series variable is problematic and I cannot figure out how I can exactly plot it. My code is:

```
Time <- x$t
X0 <- x$y[,1]
Z0 <- x$y[,5]
X0.plus.Z0 <- X0 + Z0
xdf0 <- cbind(Time,X0,Z0,X0.plus.Z0)
xdf0.melt <- melt(xdf0, id.vars="Time")

ggplot(data = xdf0.melt, aes(x=Time, y=value)) + geom_line(aes(colour=Var2))

```