[Genome] custom track wig file with + and - numbers for the same position

[Khrebtukova, Irina]

Hi,
 
I'm trying to upload a custom track wig file with chr start and some
positive or negative number and two alt colors. So far it was working
perfectly well for me until I start using data where the same chr start
could have both positive and negative numbers. You could easily imagine
the situation when some short fragments map to the the same start on
both + and - strand.
 
However, seems like I CAN NOT upload any track that has the same chr
position but different values, for example:
 
variableStep chrom=chr1 span=32
555560 -113
555560 5
 
your browser immediately throw  an error like:
track load error:
chrom positions not in numerical order at line 24. previous: 555560 >
555560 <-current

could you please advise any solution around this?
thanks!
 
Irina Khrebtukova, PhD
Sr. Staff Bioinformatics Scientist
Illumina Inc.
25861 Industrial Blvd.,
Hayward, CA 94545
ph: 510-723-9219
ikhrebtukova at illumina.com