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Figu re 8 : Top: Bes t - fit of a p ower- law t im es galact ic absorp t ion m od el to th e sou rce sp ect ru m of su p ernova rem nan t G21.5- 0 .9 . Bottom : Bes t - fit of a sep arate p ower- law t im es galact ic absorp t ion m od el to the backgrou nd sp ect ru m ext racted for th e sam e sou rce.
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[ ]X V Xσ =
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1 1 2
1 2 2
[ ] cov[ , ]cov[ , ] [ ]
V X X XX X V X
1 21 2 1 2
1 2 1 2
cov[ , ] [( )( )]
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cov[ , ]corr[ , ] .X X
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