Hi,
I was wondering if plotly is able to produce timeline charts such as these.
According to this Wikipedia article, the answer is no however perhaps there is a good workaround available.
Regards
Here’s a possible solution http://codepen.io/etpinard/pen/ORKQNV using the new bar base attribute.
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Perfect! Thanks for the help 
My x-axis would be UNIX timestamp and I have only two y-axis. Can I use start and end instead of x, y, and base in the plot?