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I did a lab on form and function in photosynthesis and I recorded the values of absorption spectrum in spinach chlorophyll extract. I have the following data and I need to draw a graph. I didn't understand what I should take for x-axis and for y-axis. Can anyone please explain this. enter image description here

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  • $\begingroup$ Are you trying to plot the slope, or are you also trying to do linear regression as well? The answer and sources that I give you depend on this. $\endgroup$
    – user36399
    Commented Jul 17, 2018 at 7:11
  • $\begingroup$ @NabeehaChowdhury I need to draw a graph which describes, how many peaks does the absorption spectrum contain? and at what wavelength is the photosynthesis greatest? How does the color of an angiosperm leaf relate to the absorption spectrum you have generated? $\endgroup$
    – philip
    Commented Jul 17, 2018 at 14:41

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It doesn't matter really, but for aesthetics sake, you'd plot the wavelength on x and the absorbance on y. We tend to visualize such data as spectral or absorbance as "peaks" on the range of interest. There's a fairly good example here. It has something to do with convention: traditionally the independent variable on x and the dependent variable on y. There's a good answer on cross-validated on the matter, too.

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