Dear David,
I'll work using two Gaussians; in fact the dual peak fit is a bit far from
the Gwyddion scope and I decided to use qtiplot to do finer, "non real
time", data analisys.
Massimo
On Tue, Mar 23, 2010 at 15:43, David Necas (Yeti) <[email protected]> wrote:
> On Mon, Mar 22, 2010 at 05:44:39PM +0100, Massimo Vassalli wrote:
> > I read the post you suggested and I agree that leveling is a critical
> point
> > in step height determination. Reasonably, using a profile is simpler and
> > clearer but in my case I need much more statistics than that I can
> obtaining
> > by widening a bit the profile. My step is not straight so I can not use a
> > wide profile without introducing an unwanted noise near the step; at the
> > same time I'm interested in obtaining a value over the whole image,
> because
> > the deviations around the mean are important (I do not have a very sharp
> > step). That's why I was thinking on using the height profile.
>
> If the peaks are well separated, fitting each individually (you can
> select a range on the graph in Fit Curve) should work well although it
> might be a little cumbersome.
>
> Otherwise, I can add a two-Gaussian fitting function if you wish --
> though likely with a just very crude initial parameter estimation method
> as automated multipeak fitting is hard and somewhat marginal for
> Gwyddion.
>
> Regards,
>
> Yeti
>
>
>
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--
Dr Massimo Vassalli
Istituto di Biofisica - IBF
Consiglio Nazionale delle Ricerche - CNR
T: +39 010 6475 571
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