What values do we get on the y axis when we use xcorr function between 2 different signals?

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SCBT BIOENG Raghavv Raghavender Suresh
Hii!
I am writing a matlab Code to check the similarity between 2 ECG signals. I have filtered the ECG signals by removing the high frequency noise and removing the baseline wandering.
I have used Xcorr to check the similarity between the two ECG signals. In the y axis I am getting some values greater than 1.
Can someone please let me know what the values on y axis are?
I have attached my correlated output signal.ram_base_running_correlated.jpg

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