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Hovermode on ribbons

using a ribbon and hovermode = ‘x’ I’d like one hoverbox to follow the top of the ribbon and one to follow the lower end of the ribbon. By default it follows the top (cf https://plot.ly/r/graphing-multiple-chart-types/ the graph at the bottom). Is there a way to attach an y-location to the hoverbox, such that I can make 2 of them?