Plotting three lines on the same plot (with four hr frequency)
First, in order to plot three different lines with a 4 hour interval you will need to resample your data. (This is how you get your frequency conversion). You can read about that more here.

pd.resample()


Then as long as all three of your "lines" are contained in the same data frame, you should have no problem plotting them by just calling

three_lines = your data frame

plt.plot(three_lines)


Although one note - just looking at your data, you might not get the desired result given the scale difference in your data. Said a different way, the values &lt; 1 might be minimally visible when plotted on the same figure as values ranging around 100.

Hope this helps. Please drop a comment if you need any further clarification.