WSPR SNR measurements

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WSPR SNR measurements

How does WSPR calculate the SNR in the WSPR database?

As far as I know, the best bandwidth for WSPR to decode the WSPR signals is 200 Hz (
Are there any references/documents that mention how the WSPR protocol measures the SNR from the received signal and then report
it from the receiver through the Internet to the WSPR database?