Wavelet Transform Approximate and Detail level

2015 5 5
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Hi all,
I am using the wavelet decomposition feature.
So for example if i'm using the level 7 decomposition level,i get two values;
a7 and d7...(a=approximate and d=detail level)
if i only had the option of picking one of the above two,which would hold more accuracy with respect to my signal?(the approximate or detail value?

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