连接器

它是用来连接ideogram上两个区域，不同半径之间： 定义方式

<plot>

type = connector
file = data/6/connectors.txt

r0   = 0.8925r
r1   = 0.999r

connector_dims = 0,0.3,0.4,0.3,0

thickness = 2
color     = black
</plot>

connetcors文件：

# connectors.txt
...
hs22 15116257 16046604
hs22 15136864 16056568
...