A few questions about ratings curves and possible adjustments

I am wondering what the deviation curve looks like regarding chess ratings, both at this site and at official (offline) chess federations. At this site I am wondering about both online (correspondence) and live chess. Also, has anyone run enough (a representative sample) of games through a top computer

Consider the power system shown in a following

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Use the Photoshop Levels adjustment

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Solved] . 2. Describe the rating curve from Question 1 and explain how