See graph below: I would like to add the wavelength as a second horizontal axis below the frequencies. For example, Frequency 4 (x10^14) corresponds to 750nm, frequency 8 (x10^14) corresponds to 370nm.

I have the data of wavelength in column I and frequency in column M. The output (y-axis) Energy Joules is in column P.

Note I dont think I should use a secondary axis, since this is same datapoint, just mapped to two different versions of input.

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