Matplotlib Target Line - Time Series Mechanics

Read the Goal First

Start with three values: Mon is 76, Tue is 83, and Wed is 79. The reference line marks the goal at 80. So Tue is above goal by 3. Mon and Wed are below goal. Read the line first, then make the above-or-below claim.

A tiny chart-reading step: read the reference line before saying a value is above or below goal.

highlighted = computed this step

Start with measured values

Start with 3 pinned measured values.

\text{pinned values}

Read the target line

Read the reference line before saying above or below goal.

\text{target line first}

Compare to the target

Place each point against the target line.

\text{compare to target}

State above or below

Readout: Tue is above goal by 3; Mon and Wed are below.

\text{above or below goal}