On 12 May, I wrote a stupid typo:
> 
>                                   1 
> Optical Density (OD) = log10 (  ------ )
>                                 (1-T)
> 

That should be

                                     1 
 Optical Density (OD) = - log10 (  ------ )
                                   (1-T)

OD is positive, not negative.

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