How to Create a Stacked Plot with the Overlay Manager:
Open and process all the spectra.
Bring to the fore the first spectrum of the series.
Choose Format > Overlay. The list of open windows appears (the foremost window is excluded).
Select the spectra that you want to import as overlays: click into the boxes at at left of their names. To select all the windows at once, click “ALL”.
Set the value (in screen points) for the progressive vertical offset between adjacent spectra. With the initial value of zero the spectra are perfectly superimposed.
Click Apply to see the effect. You can try with different values. It is easier to adjust this offset when the overlay manager is closed: click on the first overlay (from the bottom) and drag to the new position.
If the order of the spectra is not correct, try sorting them with a click into the column headers.
If you desire a different order, click ALL to remove the “overlay” check marks, then
check them again in the desired order. The first item you check goes to the bottom of the logical stack;
the last item goes on top. This logical stack is used to apply the progressive offsets.
To synchronize the table with the internal stack,
choose “List as Stacked” (on the Mac: under the “Order” pull-down menu).
You can set the color for a single overlay: click the corresponding colored rectangle on the left. The “extend” button (on the Mac: an orange arrow) extends the change to the other spectra listed above. An article on the web describes how to create a color gradient.
If the frequency scale of the overlays is not correct, click Force Same Scale (copies the frequency reference from the foremost document into the other ones).
Close the Overlay Manager. The first document stores the links to the overlays: in this way they can remain linked forever, unless you rename or delete the files (broken links are immediately forgotten). If you move all the files together, the links remain valid.