So if the y axis is the relative absorbance of light, and because we're talking about UV radiation, that means the wavelength is about 260 nm, which falls exactly in the spectrum of UV radiation. So we go from one to about 1.4. And so as we increase along the y axis, more and more light is actually absorbed by the molecules in our solution. Now, the x axis is our temperature given in Celsius. And so as we go from left to right, we essentially heat our solution. We increase our temperature and notice what we get from our experimental data.