[Genome] Missing values presentation in BED15 (array) format

[ravid straussman]

Dear Sir,
   
  I would like to create a custom track with results from a microarray.
   
  The log ratios from the array were transformed by a formula to -1,0 or +1. (-1 = not enriched, +1 = enriched, 0 = Not a clear cut case)
   
  I created a BED15 file with all data but realized that missing data got the same black color in the genome browser as data with the value of 0.
   
  Any idea how can I separate between the two?
   
  Thanks a lot,
   
  Ravid.
   
   
   
   

       
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