使用ggplot2在单个图中以图形方式表示许多曲线

I have been trying to represent graphically many curves (about 12) in a single plot using ggplot2. I initially gathered the data in a Excel sheet and transferred them as such in R. The amount of data for each curve is different, the x values for each curve are also different. As such the data can not be considered as matrix or a data set. I would like to represent the curves without extracting the data in two columns respectively in order to represent the corresponding curves.I have been trying to represent graphically