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If there occurs a gain or loss of parent isotope the point moves horizontally.
If there is a gain then the point moves right and finally if it is a loss the point moves left.
Potassium-Argon When you look at actual isochron plots such as the ones at the above source, there seems to be room for subjectivity.
Some are better than others but there is often room for multiple plot lines.
The greater the initial concentration of the parent, the greater the concentration of the radiogenic daughter isotope will be at some particular time.