Robert
I believe the correction that may be best for your type of chromatogram would be the "BaseFit BGD" correction available in Isodat 2.5.  You may need to adjust the parameters a bit to fit your type of baseline however the default tens to work pretty well.
To export data into, for example, Excel to create publishable graphs or want to use the data in another program you use the Spectrum Viewer in Isodat 2.0 or you export in the format Herbert suggested as a "*.ai" file with Isodat 2.5 which can be opened directly in Excel.  If you have N & C data you have to export the data from each sheet in the Isodat file as "*.ai" and merge them in the excel file to create the full graph or two separate analysis graphs.

Regards
Gilles

Gilles St-Jean
Chercheur / Research Scientist
Université d'Ottawa / University of Ottawa
Sciences de la Terre / Earth Sciences
140 Louis Pasteur, Ottawa, Ontario, Canada K1N 6N5
Tel: 1-613-562-5800 xt 6830 (Bureau / Office)
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> -----Message d'origine-----
> De : Stable Isotope Geochemistry [mailto:[log in to unmask]] De la part de
> Herbert Tobias
> Envoyé : 23 février 2009 08:14
> À : [log in to unmask]
> Objet : Re: [ISOGEOCHEM] Integration on sloping baseline in Isodat
> 
> Hi All,
> 
> To export the data in Isodat is simple.  You just open the file in Isodat
> and then save it as *.ai file.  That is then a text file with 4 columns:
> time, and the isotope mass signals in order.
> 
> -Herb
> 
> 
> > Enno, Robert,
> >
> > Isn't Spectrum Viewer the thing to use to export your raw data from any
> > Isodat result file?
> >
> > Benny
> >
> > -----Original Message-----
> > From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On
> > Behalf Of Enno Bahlmann
> > Sent: Monday, February 23, 2009 11:29 AM
> > To: [log in to unmask]
> > Subject: AW: [ISOGEOCHEM] Integration on sloping baseline in Isodat
> >
> > Dear Rob,
> >
> > we are also still searching for the raw data file and even Thermo couldn't
> > tell us, how to export the rae data. The only way, we found to export raw
> > data from Isodat is to go into the Instrument control window and change
> > the view in the window to list mode. Then the data are displayed in a
> > table that you can manually copy. You have do that before you start a new
> > run, otherwise the table will be lost.
> >
> > My best
> >
> > Enno
> >
> >
> > --- Robert Van Hale <[log in to unmask]> schrieb am Mo,
> > 23.2.2009:
> >
> >> Von: Robert Van Hale <[log in to unmask]>
> >> Betreff: [ISOGEOCHEM] Integration on sloping baseline in Isodat
> >> An: [log in to unmask]
> >> Datum: Montag, 23. Februar 2009, 9:51
> >> Dear isotopers,
> >> I wonder if I am missing something, but is there no way to fit a
> >> sloping baseline for peak integration in Isodat? If that is the case
> >> then can the raw data be exported as text file or similar? Thirdly,
> >> can anyone suggest a favourite
> >> (free?) program that might perform this duty for me? (do you want me
> >> to import it to Masslynx?) Any suggestions or references to previous
> >> postings would be most welcome Thanks Robert Van Hale
> >
> >
> >
> >