Kosmos 1 Owner's Manual page 44

High (plus day): On any days which appear abovc the critical line on your biorhythm graph,
you
arc on what researchcrs call a high. On those days, you are apt to have more energy,
feel more emotionally stable and be more alert.
Low (minus day): On any days which appear below the criticallinc, you are on a low. So, the
conditions above are prone to
be
just the opposite.
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