root system   reduced mass  #
-----------------------------
A14           1/2           1
D14           1/2           1
2E7           1/2           1
A2 A12        1/2           1
2A1 D12       1/2           1
A5 D9         1/2           1
A9 D6         1/2           1
A7 E7         1/2           1
D6 E8         1/2           1
A1 D7 E6      1/2           1