singular or plural referring to the components of a group
"...the low-eNd and high-eHf end is partial melts from garnet pyroxenits..."
This is a technical paper so the nouns aren't important (eNd, eHf are isotopic measurements, garnet pyroxenite is a rock names for the minerals it contains). The sentence is referring to a plot of many measurements that form a line, we are referring to one end of that line which is made of several points. My question is whether to use the singular "is" (in bold) because "end" is singular, or the plural "are" because the "end" is made of many partial melts. Thanks.
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