[Genome] Possible WIG display bug?

[Hiram Clawson]

You can not mix up span specifications in the same data set.
The larger span data values take precedence over the smaller span
data values.  A single data set should have a consistent
span for all data values.

See also, the last paragraph at:
http://genomewiki.ucsc.edu/index.php/Wiggle_BED_to_variableStep_format_conversion
and: http://genome-test.cse.ucsc.edu/~hiram/wigPresentation/slide160.html

--Hiram

Gordon Robertson wrote:
> Hello
> 
> If I'm missing something obvious I apologize in advance, but two of us have
> looked at this, and we think that we're seeing odd behaviour.
> 
> I've attached a txt file with two fixedStep regions declared in a single
> track. When I submit this as a custom track file, it's accepted by the
> genome browser. I've attached a PDF screenshot (hg18) that shows that only
> the second region displays, while the first region shows nothing. The track
> header line was taken from your web help page's example file, with graphType
> reset to 'bar'.
> 
> Is this file flagging a problem, or have we made a mistake in the file?
> 
> Thank you for your help.
> 
> G