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galactic absorption (interstellar absorption, abundances - Morrison-McCammon)

     

  displaymath18535

where tex2html_wrap_inline18537 are element abundancies and tex2html_wrap_inline18539 the photoelectric absorption cross sections [Balucinska-Church and McCammon1992].
 
gabs(1,2,1,...,16,17)
   

tabular7260

 

Note:The given ``abundances'' are normalized to the hydrogen ``abundance'', which has in this scale the value 12. The true abundances can be calculated from these numbers in the following way:

displaymath18547



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