WSPR QRG accuracy

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I let the WSPR run a couple of hours on 20mtrs today, just to test the reported QRG's. I checked my TX QRG accuracy & stability before and after the data collection to be within 2 Hz.
I expected to get a symmetrical Gauss distribution but that was not the case. Please look at the frequency deviation of total 41 stations with 270 spots. The mean freq deviation spot of each station is plotted. Only 16 out of 41 stations had a max deviation of + and - 4 Hz.

Time to check the TX folks or use the freq correction in Version 2

73/Bram