plot() for MassSpectraplot() for the MassSpectra class
plot has no generic by default## S3 method for class 'PeakList,missing':
plot(x, y, ..., mzRange = c(0, 200),
plotDeriv = FALSE, plotPeaks = TRUE, plotWidths = TRUE)mzRange allows choosing the plot range directly according to the mz number
(when calibrated).