icoord，dcoord和color_list描述的是链接，而不是叶子. icoord和dcoord给出图中每个链接的拱形"(即上下U形或J形)的坐标，而color_list是这些拱形的颜色.在整个图中，icoord等的长度将比ivl的长度小1.

icoord, dcoord and color_list describe the links, not the leaves. icoord and dcoord give the coordinates of the "arches" (i.e. upside-down U or J shapes) for each link in a plot, and color_list is the color of those arches. In a full plot, the length of icoord, etc., will be one less than the length of ivl, as you have observed.

不要尝试将ivl列表与icoord，dcoord和color_list列表对齐.它们与不同的事物相关联.

Don't try to line up the ivl list with the icoord, dcoord and color_list lists. They are associated with different things.