Recognizing+Ca+II+break

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4000Å. In other words when a "cliff" is made in the spectra on the left side. (only cliff up as shown in picture below).
 * CaII break**: The "calcium break" is an overall decrease in flux on the blue side (the left side) of the spectrum beginning somewhere around the calcium absorption doublet ~
 * [[image:95746572 caption="Ca_II_break.jpg"]] ||
 * Ca_II_break.jpg ||