Simulated noisy double-peak CCF with peaks located at 36.0 km s-1 and 72.0 km s-1 (left), 48.0 km s-1 and 72.0 km s-1 (centre), and 54.0 km s-1 and 72.0 km s-1 (right). Grey lines show derivatives from a simple finite differences method which have the drawback of being very noisy. Instead, black curve with dots (in panels below the top one) show the smoothed derivatives computed with Eq. (2). Red lines in the top panels show the threshold parameter on the CCF (THRES0) and in the middle-low panels the threshold parameter on the second derivative (THRES2).
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