Scientists use a ratio that describes the relative amounts of each element

Question

when constructing composition-based images of celestial objects. Table 1
provides a model for how you can use flux data to calculate a whole number
ratio for three elements (X, Y, and Z) that you might find in the sun. The
final column of the table provides the whole number ratio of the elements in
the sun.

Answer 1

I'm sure it's a great table, but it can't be posted here.
And ya never even got around to asking a question didja?

Answer 2

It's Z I'm pretty sure