Other vendors(marketdelta is one of them) offers the possibility of choose if the shade depends of the Delta or total volume in that cell.
Example:
With Delta shading, 100x500 could be a darker green, but 2000x2100 will be light green
With volume shading, 100x500 will be light green and 2000x2100 will be dark green.
Some traders could see more relevant the price with 4100 contracts than the price with 600.
I think you can implement the option to choose the shading between volume or Delta.
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