[shenyang]

I do not believe I understand the 3 colors on the graph. 120 can be high, low, or average.

[dano]

High (Red) = the highest BG test that you have input.
Average (Magenta) = a numerical average of all the BG tests that you have input.
Low (Blue) = the lowest BG test that you have input.

I hope the information helps.