[Chimera-users] volume and area units

Pu Qian p.qian at sheffield.ac.uk
Fri Sep 8 09:54:08 PDT 2017

Hi Elaine,

Thanks. Understood.


On 8 September 2017 at 17:22, Elaine Meng <meng at cgl.ucsf.edu> wrote:

> Hi Qian,
> The e3 just means exponent, in other words, multiply by 10**3
> (thousands).  It is not the units.  The units are based on whatever length
> scale the data are in, usually angstroms, so the volume would be cubic
> angstroms and the area square angstroms.
> I hope this helps,
> Elaine
> -----
> Elaine C. Meng, Ph.D.
> UCSF Chimera(X) team
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
> > On Sep 8, 2017, at 1:01 AM, Pu Qian <p.qian at sheffield.ac.uk> wrote:
> >
> > Dear Chimera developers,
> > I'm using Chimera to estimate molecular weight from cryo-em map through
> volume viewer/tools/measure volume and area/
> > The value of the volume I got is in e3 unit. What dies this e3 mean.
> This e3 unit is used for area as well, which confused me.
> > The version I'm using is 1.12.
> > It seems that the e3 equals nm3, but I'm not sure. It would be a great
> appreciated if you could help me to make it clear. Thanks
> > Best regards
> > Qian
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