... ACIS

http://asc.harvard.edu/proposer/POG/html/ACIS.html

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...$t_{\rm cool}$

To avoid confusion, here we use the notation " $t_{\rm cool}$'' which is compared with $t_{\rm adv}$ or $t_{\rm dif}$, in order to distinguish " $t_{\rm loss}$'' used when one compares with $t_{\rm acc}$ or $t_{\rm age}$.

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