different tissue definiton in OSTC and subsurface

[Henrik Brautaset Aronsen]

Diego Mainou wrote:
> About the values used on the ostc. I remember discussing on their forum
> something about the Buhlmann version of the tables. They are using the
> last published tables by Buhlmann which were only published in German.
>
> Sorry I can't give you the full info as I'm overseas reading on the
> phone... diving in isla mujeres... near Cancun...

Here's something from the German forum (translated by Google) [1]:

>> [Buhlmann] model used [in the OSTC] is 2002 edition, ZH-L16C, option 1a.
>
> Thats why i ask. The OSTC model is NOT using these values ​​for N2!
> 5th in My book Buehlmann diving medicine Edition, Page 158 is the t1 / 2 N2 time in minutes for compartment for Item 4 3 12.5 6 38.3 18.5 Comp and Comp 7 54.3
> OSTC is using 12, 18, 39 and 55 for the values ​​and e2secs e1min e10min are calculated with the rounded values ​​OSTC.
>
> For helium you are using the original Buehlmann values.
> The point is that you should use the same base for the halftime values ​​for n2 and He. The same means that the He values ​​in Buehlmann n2 are the halftime values ​​divided by 2.65. (Ok, the 2.65 can be discussed but Buehlmann uses this value so it is ok).

Cheers,
Henrik

[1] 
http://translate.google.com/translate?sl=de&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fforum.heinrichsweikamp.com%2Fread.php%3F2%2C4996%2C5109&act=url