Plot generic for SmithWilsonYieldCurve objects
# S3 method for SmithWilsonYieldCurve
lines(x, y, ..., aspect = c("cts", "zero"))
No return value, called for side effect of drawing a graph of the curve
An object of class SmithWilsonYieldCurve or a vector of terms to evaluate the curve at
Optionally an object of class SmithWilsonYieldCurve
other arguments to pass to the default lines function
either "cts" for continously compounded spot rates, or "zero" for ZCB prices