Rename 'main dataitem' in template appendix
what does "main data item" mean?
A single template can produce multiple data products, so the main data product is described in the Appendix. We can tackle this when we actually include such templates (for High Contrast Imaging).
Yes it is mostly one-to-one, the link you want is essentially already there. There is a link to the main dataitem in Section 6 and from there to the headers in Appendix D.
OK, then I suggest you say "main data item produced by observing Template"