Good day, Mary!
You're right that at the least each "E" standing alone in your example needs a grade 1 symbol indicator.
I like this suggestion you've made of enclosing your table in a grade 1 passage. If you do so, be sure to insert the "dot locator for use" (Rules of UEB section 3.14) along with your grade 1 passage indicator and grade 1 terminator when they each appear on a line by themselves.
A .BRF is attached with a transcription of the snippet you provided.
P.S. You may post your UEB questions, even about technical material, in the UEB thread of this forum.