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    Re: Extinction
    From: Geoffrey Kolbe
    Date: 2014 Feb 04, 10:32 +0000

    Hello Gary
    
    The brightness at which you can no longer see an object depends on the
    ambient light level. So, you will get a different result at night.
    
    --
    Dr Geoffrey Kolbe, Riccarton Farm, Newcastleton, TD9 0SN
    Tel: 013873 76715 Mob: 07811 154621
    
    

       
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