[Genome] Signal densities data in the Broad H3 ChIP-Seq track

[Goncalo Castelo-Branco]

Hi,

I have the following question, in the mm8 genome view, when viewing  
the signal densities data in the Broad H3 ChIP-Seq track (Expression  
and Regulation), sometimes there is a black line at the value 1, which  
is not described in the legend. Is this a experimental threshold? Can  
the peaks that are seen below this line considered positive reads?

Thanks!

Goncalo

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