... last 6 Gyr

Intermediate MAss Galaxy Evolution Sequence, ESO programs 174.B-0328(A), 174.B-0328(E).

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... package

http://cow.physics.wisc.edu/~craigm/idl/mpfittut.html

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... thresholds

For a distribution of n points, these thresholds are $\sqrt(6/n)$ and $\sqrt(21/n)$ respectively (n=16 is the present case).

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