[R] Plotting two lines on a graph when using par(mfrow=)

[eric]

Basic question but still learning ....

How do I plot two lines (f$equity and f$bh.equity) on one of the three
graphs under mfrow ? I tried putting brackets around the first plot and
lines command but that didn't work.

par(mfrow=c(3,1))
{plot(f$Date,f$equity, col="blue", type="l", main="equity")
lines(f$bh.equity, col="gray")}
plot(f$Date,f$indicator, col="green", type="l", main="indicator")
plot(f$Date, f$SPY, col="red", type="l", main="SPY")

What I want is the first graph to have two lines(equity and bh.equity), then
the next two graphs to have one line each.

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