An integer vector of length one or two. If length one only bases up to the percent
quantile of read lengths defined by the given value are shown. A vector of length two gives the
start and end base between which the GC-content is plotted.
type
The type of the plot (see ‘plot’).
col
The plotting color.
xlab
The X axis label.
ylab
The Y axis label.
...
Arguments to be passed to methods, such as graphical parameters (see ‘par’).