major drop in hum level this week in Vancouver BC, kids went back to school 
adults back to work, could be external background commuter noise or heavier 
electrical load on HV elec lines ( 3Km away) or both.
 
 

On Thursday, 14 June 2012 01:04:22 UTC-7, john dawes wrote:

>  The readings are only relative not absolute. They were made at the same 
> location indoors, Had the readings been made outside in an open space I 
> would expect to find the same relative graph but on a smaller scale.
>
> The readings are available here as an Excel file.
>

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