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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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