Adding histogram/Frequency bar plot track in circos plot.

[Arushi Mahajan]

Hi, 

I am a beginner at circos plot and have been stuck at a problem from the past week. 

I am doing all the coding in r. I have a df similar to this link https://stackoverflow.com/questions/39188761/circlize-chord-diagram-with-multiple-levels-of-data/39192919#39192919

I have used the same code for group by regions with some minor changes.

Now, I would like to insert a new track of Histogram/Frequency bar plot after the first track that is South Asia, North America etc. 

So after the first track, I want to plot the flow values for each regions as histograms or frequency bar plot. 

Any help would be appreciated. 

Thanks.