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Coverline - How To Draw It On Your Temperature Chart

Q: How do I draw a coverline when fertility charting?

A: Follow these steps to draw a coverline on your BBT chart:

  1. You identify a temperature that is at least 0.2 or two-tenths of a degree higher than the previous six days.
  2. Highlight those previous six days
  3. Find the highest of these six highlighted temperatures
  4. Draw a straight line that is 0.1 or one-tenth of a degree higher than that of the highest of the highlighted temperatures
  5. This line is your coverline
  6. The coverline should run straight horizontally across your chart

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