Denis—

Many thanks for your explanation. It works very well in my separating
components (chapters) and is going to save me a lot of time.

Thanks too to Hans.

And my apologies for missing the earlier discussion: my internet access and
email has been very flakey of late and I know that I have lost messages. In
fact, I found Denis’s reply and the earlier exchange by going to the list
Archive.

All best, Alan