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The Security Characteristic Line (SCL) associated with the single-index model is a plot of the security's excess returns on the vertical axis and the market index's excess returns on the horizontal axis. O the market index's returns on the vertical axis and the security's returns on the horizontal axis. the market index's excess returns on the vertical axis and the security's excess returns on the horizontal axis. the security's returns on the vertical axis and Beta on the horizontal axis. the security's returns on the vertical axis and the market index's returns on the horizontal axis