What Does It Mean By C 1 T 1 C 2 T 2 C 3 T 3 C 4 T 4 8

What does it mean by C1T1+C2T2+C3T3+C4T4/8? The numbers are supposed to tiny and to the right of the big Letter. I don’t remember what that’s called. Are they referring to the corresponding bits of information I have. They aren’t clearly labeled as such, except as time period and 4 time periods and concentrations and have 4 corresponding listings in ppm.

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