Hi, I'm trying to plot multiple lines on one plot. I have a data frame raw, and i want to plot raw$date on the x-axis and raw$theta, raw$vega, raw$delta, and a few others on the y-axis, with a legend. However, I'm not sure what the scale of those data sets are, and I don't know which one will have the largest scale. How can I plot this? I've tried ggplot (qplot), but it doesn't seem to be capable of multiple lines.
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