Most charting tools produce the same kind of charts. A chart has a vertical axis on the left (or right) and a horizontal axis on the bottom (or top). You can add more axes but they are stuck to the sides of the chart and keep occupying the whole length of the chart area. In medical applications we want to have charts like the one below. For the interested: The first five signals are EEG signals, (the electrical activity in the brain). Below the EEG signals are the patients breathing signal, the blood pressure and the heartbeat (ECG) signal.