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Click outside the graph and then inside the graph to get 'cross-hairs' to better measure the values in the graph
Move the mouse outside the graph again to hide the 'cross-hairs'
Use the 'cross-hairs' to measure the peak and maximum energy of the X-rays
When you make the 'cross-hairs' the y-value tells you how many x-rays are detected at that energy (in thousands of x-rays), the x-value tells you what energy those x-rays have. e.g."y value=112k x-rays x value=74.5keV" means that there are 112,000 x-rays with an energy of 74.5 keV.
The yellow curve is the final result after any filtration, the green curve shows the result before filtration - so you can compare the effect of filtration
The cross-hairs only work on the yellow curve (to attempt measurement of the green curve redraw it with no filtration)
If there is no filter then you only see a yellow curve - the 'green' curve is 'yellow' (is that clear?)