OUTPUT DATA of Subreteaua_1 :
m(0) = (0, 180)
IB-state 1, t from 0 to 90
V = ( 0, 2 )
m
1
(t) = 2*t
m
2
(t) = 180 - 2*t
m(90) = (180, 0)
IB-state 2, t from 90 to infinity
V = ( 0, 0 )
m
1
(t) = 180
m
2
(t) = 0