Hello, Amelie,

If I understand your question correctly, you are asking if
it is possible to superimpose two tracks o the same set of
axes for direct comparison?

We agree that it would be great to be able to do that.  That
capability is in place for our resident tracks, but was only
recently implemented.  It is on our list of things to do to make
the functionality available for Custom Tracks, but I cannot say
when we be able to roll that out.

You may be interested in the Track Hub system which gives you
the much of the same capability for your own tracks that we have
for our resident tracks.  Please read about it here:

   http://genome.ucsc.edu/goldenPath/help/hgTrackHubHelp.html

to see if it suits your needs.

You can see the overlay feature in operation in some of the
Summary tracks in the Epigenomics Roadmap tracks on the hub
page:

   http://genome.ucsc.edu/cgi-bin/hgHubConnect

regards,

                        --b0b kuhn
                        ucsc genome bioinformatics group


On 3/12/2012 3:18 AM, Amelie Baud wrote:
> Dear all,
> 
> Is it possible to overlap two custom tracks, so that the values on the y-axis 
> can be compared for a given position on the x-axis (position on the 
> chromsome)? That would be very helpful.
> 
> Best wishes,
> 
> Amelie
> 
> 
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