Straight Line in Alpha Rarefaction Plot


I would like to ask what does it mean by the straight line in the alpha rarefaction plot? I have attached the screenshot here.

Thank you for your kind help!

This lines demonstrate how the number of samples will change depending on which sampling depth you will choose for rarefaction as in core-metrics command.
I guess that all your samples have more than 15000 reads, so you will not loose any samples by choosing any sampling depth up to 15000. I think if you will recreate alpha rarefaction with higher value then you will see some decline.

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Okay, understood. Thank you very much for your quick reply!

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