Closed:ggbio circular plot color tune

Question

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Hello everyone,

how to tune colors in geom="link" at ggbio package? There are only two variants for that: orange and green and I can not control it. Is it possible to change it e.g. to black and gray colors?

Example of my code:

plot <- ggplot() + layout_circle(hg19Ideo, geom = "ideo", fill = "gray95", radius = 30,
                                   trackWidth = 1.5)
plot <- plot+ layout_circle(gr, geom = "link", linked.to = "to.gr", aes(color = score),
                     radius = 16.3, trackWidth = 1)

Thanks in advance.